3 months: This clenching of the fists is called the "hand grasp." it is a primitive reflex that disappears at roughly 3 months of age. In almost all infants it gone by 4 months of age. If not, it can be an early sign of cerebral palsy. If your baby still has this at 4-5 months of age, please bring it to the attention of your healthcare provider.
Answered 9/22/2018
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Grasp reflex: Babies start losing their grasp reflex around 2 to 4 moths and gone at 6 months.
Answered 11/11/2015
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