Parents with a bouncing baby on the way often wonder which of the physical traits they possess will be passed on their mini-me. Will she have my eyes? Will he have my smile? I wonder if he'll have my hands? Do you think she'll have my eyebrows? When laying eyes on a new baby for the first time, parents may quickly identify traits baby has that emulate his or her mommy and daddy.

Baby's physical characteristics are completely based on DNA: what all of us are made of. DNA is put together into long, thin strands known as chromosomes, and housed inside of human cells. Dad's sperm and Mom's egg each start out with only 23 chromosomes. Combined, they form a single cell that contains 46 chromosomes. Genes are housed on chromosomes and contain the information parents are dying to discover as they await their child's arrival: what baby's traits will be. This single cell multiplies about a trillion times into a captivating, cooing little darling that is equal parts Mom and Pop.

Mom and Dad each have a special part to play when it comes determining a child's appearance. Some traits come from Mom, others from Dad, and others still are a complicated combination of both parents. The echoes of themselves progenitors see in their offspring are stunning, special and awe-inducing. When Mom and Dad gaze at baby after his or her arrival, they may excitedly exclaim, "She has my toes!" or "He has my jawline!" and realize how amazingly miraculous it is that they made a freakin' baby. Read on for 15 physical traits and who they come from.

16 Face Shape

Let's face the facts: the face is one physical trait that everyone sees. It's often how we're judged, right or wrong. Some children are such a mix of Mom and Dad that they appear completely different from either parent, but if one progenitor or another has dominant features, there's a good chance that Mom or Dad will have a child that is a window into his or her youth.

Reese Witherspoon and her daughter, Ava are one example of this phenomenon. An oval-shaped face is a dominant feature, while a square-shaped face is recessive. An oval-shaped face is characterized by high cheekbones and a narrow chin, which pretty much describes Reese's face to a T. Ryan Philippe, Ava's father, has the quintessential square face shape of a rugged leading man. Because oval-shaped is the dominant trait, when Ava is complimented on her lovely features, she is able to say confidently, "I got it from my mamma!"

If both Mom and Dad have oval face shapes, or square ones, there is still a chance of a child having the opposite due to recessive genes from past generations that may present themselves. However, chances are good the ovals have this one.

15 Full Or Thin Lips

Pucker up and give that squishy new baby a smooch! Baby's tiny mouth may mirror Moms, compare to Dad's, or even resemble Great Aunt Petunia's. Lips fall into two categories: full lips and thin lips, though there are many variations in between.

A full, luscious pout is dominant trait, while thin lips are recessive. This means if either Mom or Dad have a pillowy frame for their pearly whites, baby will too. If both parents have lips that are more on the thin side, baby has a better shot of being slim-lipped as well.

Kylie Jenner has recently perfected the art of painting on fuller lips, so if baby isn't happy with what Mom and Dad gave her, direct her to Kylie's website for a tutorial. Just wait until she's old enough to understand you when you explain to her that she's as beautiful as can be just the way she is.

14 Height

Experts in the field of genetics are still struggling to determine exactly which genes are responsible for a person's stature. Height is determined by genetics, but also by a child's nutrition, especially early in life. Research has shown that a child's eventual height is about 80% genetics and 20% nutrition.

While geneticists have been able to find specific genes that determine certain factors like eye color and hair color, height isn't so simple. It is estimated that up to 30 different genes may be responsible for determining how tall a person is. This is the reason two siblings from the same family may vastly different heights. Genes from Mom and Dad both play a factor, but with so many genes coming into the equation, a child's height may depend a lot on which genes he gets.

Of course, if Mom and Dad are both extremely tall or extremely short, there is a better chance their children will follow suit. If Mom is 7 feet tall and Dad is 4 feet tall, one child may be towering over the rest of the world like Mom while another is looking up to most everyone just like Dad. As mentioned previously, nutrition is another factor that helps determine a child's height that has nothing whatsoever to do with genetics. Children who get plenty of protein, calcium and the vitamins A and D have a better chance of reaching their height potential than those who are malnourished.

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12 Baldness

Contrary to the popular belief that baldness is a trait to blame solely on Mom, this physical trait, which is actually quite dapper, can also come from Dad. It is true that the primary baldness gene is found on the X chromosome, the one that comes from the mother. However, recent research has proven that men with a bald father are more likely to develop male pattern baldness than those who have a pop with a full head of hair.

The good news? Guys like Bruce Willis rock the bald look and have helped make it cool to be bare up there. So much so, there are men with luscious locks that opt for the cleanly-shaven noggin look, even if they have a full head of hair.

We can't deny there's something pretty attractive about a come-hither stare pared with a sleek and smooth dome. Sons should do nothing but thank Mom and Dad for the baldness genes if they are lucky enough to to inherit them. Live bald or die hard!

11 Dimples

Dimples are one of those traits that melt hearts and induce ooooh's and awe's whenever they present themselves. Good news for parents blessed with this feature? Dimples are a dominant trait, meaning if Mom or Dad has a sweet little indentation that reveals itself at every irresistible grin, chances are likely that baby will have it too.

If both parents have dimples, chances are even better. Feeling blue because neither you nor your partner got this charming trait? Don't despair! There's still a chance. Recessive traits can take over dominant ones if everything lines up just right, meaning Moms and Dads may still have the dimple gene somewhere in their DNA as long as it's shown up at some point in the family tree.

Baby may flash a dimple the first time he smiles even if the trait has been hidden for the last three generations. Plus, even if your little one doesn't end up having cheek dimples, every baby has an adorably dimpled little bum.

10 Eye Shape

Pretty peepers are a captivating physical trait that give us a glimpse into what another person is feeling and thinking. The two main eye shapes are almond-shaped and round. Eyes also vary in size. Some may seem to take up a large portion of a person's face, while others exist in exact proportion with a person's nose and mouth.

Almond-shaped eyes are dominant, while round eyes are recessive. If one parent or both have almond-shaped eyes, chances are good baby will too. Of course, there is much more to the windows into a person's soul than just the shape. Eyes may be deep-set, hooded, protruding, upturned, downturned, close-set or wide-set.

The bottom line? Many factors go into determining a person's eye shape and structure. Mom and dad will most likely see at least bit of their own eyes in those of their children. It is also likely the eyes of offspring will be identical to Mom's or Dad's.

9 Cleft Chin

Is there anything more adorable than a cleft chin? Probably. Maybe a kitten kissing a baby sloth or something like that, but cleft chins are definitely right up there. Sadly, cleft chins are rare due to the fact that they are a recessive trait. This means both Mom and Dad must have the cleft chin gene for baby to have a chance at getting this coveted trait. No cleft is a dominant trait that may still prevail even if both parents have the cleft gene.

The good news is, because clefts are one of those rare traits that don't show up all that often, when they do, it's a cause for major celebration. Someone should probably make up a dance to do when a baby pops out and reveals that he has a cleft in his chin.

Parents who hope for their baby to have a chinny-chin-chin akin to Superman and Demi Lovato have a chance, even if neither of their chins have a cleft. Because this trait is recessive, it could go undetected for generations and reveal itself in a baby coming soon to a delivery room near you.

8 Tricky Tongue

While tongue tricks may gross some folks out, others find the ability to twist and contort a taster quite attractive, and awesome. Take Daniel Radcliffe, for example. He can make 3 rolls in his tongue at once. We're pretty sure this is the reason he was chosen to play Harry Potter, because his tongue is actually magical.

Here's the real deal with tongue stunts: if parents can do some cool stuff with the strongest muscle in their bodies, chances are pretty good the children will follow suit. The ability to roll the tongue is a dominant trait, while being unable to roll is recessive. This means if Mom or Dad has this trick down, it's likely just a matter of time before baby can do it too.

Tongue folding is a fancy trick reserved for a select few. Being able to fold the tongue is a recessive trait, while not being able to fold it is dominant. Dammit all. The only way to fix this problem is to start setting practiced tongue folders up on blind dates and hoping they make babies. Since the tongue folding trait is recessive, even if both Mom and Dad have the gene, baby may not be able to do it. Let's just hope and pray that the stars align and at least a few babies of the future are blessed with this beautiful gift of tongues.

7 Free Or Attached Earlobes

Damn, girl! Those earlobes are everything! One trait that often goes unnoticed is the state of a person's earlobes. Unless one is an earlobe guy or gal, the chances of being able to name even your own mother's earlobe type are slim to none. Can you? Didn't think so. If you can, you should become a detective or something.

Celebrities with attached earlobes include: Mila Kunis, Tom Cruise, Angelina Jolie, Gwyneth Paltrow, Simon Cowell, Emma Stone and Mark Wahlberg. So, basically, if you or your future offspring get this trait, you're in freaking great company.

Unfortunately, the attached earlobe gene is recessive, while what is called the free lobe gene is dominant. If mom's earlobes are attached, but dad's are free, chances are higher baby's will be free as well. There is always the chance, however that dad has the recessive gene and baby will get the coveted attached earlobes. One can only hope.

6 Widow's Peak

What do Kourtney Kardashian, Leonardo DiCaprio, Marilyn Monroe and Collin Ferrell have in common? They've all been blessed with the gorgeous hairline known as a widow's peak. The name for this hairline, that dips into a V near the middle of a person's forehead, has its origins in the long ago. Widows in days-gone-by would wear hoods after their husbands died that partially covered their foreheads. Because of this, it was believed that women who had a widow's peak hairline were doomed to live through the untimely death of their significant others. Well, that's depressing.

Despite the dark past of this physical trait's name, it's one of those features that makes a person stand out, in a good way. Some geneticists believe the widow's peak is a dominant trait that comes from a specific gene, while others feel more research is needed to be sure.

Whatever the truth, those with widow's peaks usually have at least one parent with the same hairline. The gene for a straight across hairline is believed to be recessive, meaning if anyone is ever lucky enough to bear Leo's child, the baby is likely to have his dad's debonair hairline. Sigh.

5 Curly Hair

Curly and straight hair are physical traits known as polygenic. This means no one gene has been determined that will guarantee a person's hair is straight or curly. Researchers call a trait polygenic if they believe a variety of different genes come together to determine a certain physical trait.

Despite this trait being difficult to determine, there are some factors that may cause some children to have a better chance of getting curly hair than others. It is assumed that the genes that determine curly hair have incomplete dominance. Basically, if Mom has lovely, cascading curls and Dad's hair is as straight as a ruler, the chances of baby getting mom's spiraling locks are greater than her having dad's stick-straight mane.

If both have parents have curls, the chances are greater baby will too; while if both parents have stick straight hair, its less-than-likely that baby will have curls to rival Shirley Temple's.

4 Freckles

Freckles have been called kisses from the sun and we can't think of anything sweeter than a tiny sun kissed tot. While freckles were once undesired by some, they are currently all-the-rage. In fact, fake freckles have been called "the next big thing". Many women are painting on fake freckles in an attempt to obtain a younger, fresher look.

Good new for parents with flecks of gorgeous freckles: this trait is dominant, while a freckle-free face is recessive. This means if either Mom or Dad are sporting a freckled nose or speckled shoulders, it's highly probable baby will eventually look the same after a day of fun in the sun. If both parents have freckles chances are even greater, while if neither parent has a spot in sight, baby most likely won't be freckled either.

Rashida Jones, Eddie Redmayne, Emma Stone, Josh Hutcherson, Lucy Liu, Common and Olivia Munn are all freckled celebrities that have helped turn freckles into the latest and greatest of all physical traits.

3 Long Lashes

A hot trend for women these days is lash extensions or, at the very least, false lashes. It seems every lady wants thick, sultry eyelashes. Some are born with this coveted trait and will be the object of envy for the rest of their lives.

Luckily, the gene that determines long lashes is dominant, while short lashes are a recessive trait. As seems to often be the case, if Dad's lashes scratch his sunglasses when he blinks his eyes, while mom has to layer on seven coats of mascara before it's even apparent she has eyelashes, baby has a better chance of being blessed with Dad's lashes than Mom's.

If baby has dark hair, her lashes will be more apparent than a little one with lighter locks. If parents have dark hair and full eyelashes, chances are baby is going to be one beautifully lashed little lass without ever having to bat an eye.

2  Eyebrows

Eyebrows are the picture frames that showcase the lovely shades of blue, green, grey and brown in a person's sparkling eyes. Recently, thicker eyebrows have become on-point, while more slender brows are out. Many make-up artists color in brows of clients with a dark pencil to make them appear more robust.

Gone are the days of shaving eyebrows off, then painting them on. If you still do that...cool, but you could save yourself a lot of hassle by just letting those babies grow. Of course, brow maintenance is still en vogue, and unibrows are still considered unattractive. In fact, Kim Kardashian was once accused by haters on social media of waxing, or possibly photoshopping, her daughter North's brows to get rid of a slight unibrow situation.

Broad brows are a dominant trait, while slender ones are recessive. If one or both parents have thicker brows, baby's will most likely follow suit. Separated brows are dominant, while joined ones are recessive. Stressed because Dad has a unibrow? It's likely baby won't have one unless Mom has one too. Don't stress about this one. You can always wax your baby's brows if you don't like them. Kidding. Kidding. Sorry, Kim and Kanye. Too soon?

1 Facial Expressions

Geneticists have not yet found the illusive genes responsible for facial expressions being passed down from one generation to the next. They may even argue the gene doesn't exist, but we know better. We've all caught ourselves making the exact same face as our own mothers and fathers and been freaked-the-hell-out. Chances are you've seen a reflection of your mother-in-law in your partner's face on one occasion or another, for better or for worse.

While catching ourselves making the faces our parents make can be a little unnerving,  seeing a face we make often, or one made by our partner, on the face of our child is quite possibly one of the most special and surreal things about parenthood.

After all, we made these babies. They started out as just 23 little chromosomes in Mom's egg and 23 in Dad little swimmer. They came together despite tough odds, and together became one cell containing 46 chromosomes. From that one little cell, baby is formed into his own unique little being. He'll have lots of Mom and lots of Dad and lots of himself all rolled into his own wonderful person. Whatever traits baby inherits, chances are good Mom and Dad will feel he's absolutely perfect.

Sources: WebMD.com, ScienceProfOnline.com, Babble.com, DNATesting.com, ScientificAmerican.com