Dr. Caspar Addyman, a developmental psychologist, has compiled the Nine Faces of Weaning guide with Piccolo, an organic baby food company.
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The guide shows parents how to interpret their babies' expressions when eating while being weaned.
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For example, when babies purse their lips and squint, they may simply be reacting to sour food.
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Dr. Addyman says that parents should see the introduction of new foods as a chance to get to know their baby better .
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"If a baby is really unhappy, you will know about it," he says, encouraging parents to be patient.
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