A photo of a baby waving bye-bye, a developmental milestone that most babies can reach once they are seven to 14 months old.
Although waving hello and bye-bye seems like just a fun thing to teach your baby, it is actually an important developmental milestone. Most experts think that it can be an early sign of autism or another developmental disorder if your child isn't making any gestures by the time he is twelve months old. These gestures include waving, pointing, and reaching for things.
Keep in mind that most babies can wave once they are seven to 14 months old.
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The Denver Developmental Assessment (Denver II)