my son is 1 month 15 days old.... when I keep mu hands on front of his eyes he is not blinking his eyes ... how to know if baby eye vision is good or not

A. cNnot do by this technique compared to their 1st month, when they only focus on objects about a foot away, babies three or four months of age have better color perception and can start to make out other objects besides faces, like toys. by 4 months, they should also start to show more conscious behavior like reaching for their toys and smiling deliberately at you when you make eye contact. babies might show a reflexive smile, grinning for no apparent reason, from birth, but between 4 weeks to 4 months, they'll develop a social smile, either responding to another person or trying to get someone else to smile at them.