If you think your baby's head is uneven or not growing properly, don't panic. It might well be something that is easily fixed.
Knowing what to do and what not to do when caring for your baby can feel pretty daunting. Truth be told, especially with baby number one, most of the learning is done as you go along. Many of us have never changed a diaper until we have a baby, and perfecting that skill is not something you can learn by reading about it in a book.
On a more serious note, keeping an eye on the shape of your baby's head is also extremely important. You have probably heard of a baby's "soft spot." That is present due to the infant's skull bones not yet growing together. Mayo Clinic explains there are two reasons for that. So that the baby's head can make it through the birth canal, and to accommodate for the baby's rapidly growing brain.
Having unfused skull bones can cause a baby's head to appear uneven. That can be caused during birth or even months afterward depending on how your baby lies and sleeps. If you notice this happen to your little one, the most important thing to remember is it won't do any damage to the baby's brain. It is merely cosmetic.
There are ways to prevent this from happening, or to even out an uneven head should you notice things aren't quite right. If your child always tends to sleep on one side of their head, try lying them the other way and alternate which side they sleep on. This can also apply to when you hold your baby, and might well be easier to control as your little one might move or roll over in their sleep.
Ultimately this isn't something you should spend too much time worrying about. Definitely don't obsess over the shape of your baby's head and spend hours of your day staring at it. If you are worried, consult a doctor and they will be able to tell you more about what's normal and what isn't. They will also be able to take further steps/offer other advice should they deem it necessary.