When to expect a social smile Infant is 9 weeks old doesn’t smile yet but coos and tracks objects but tracking is inconsistent Is it to wry

A. After the age of 12 weeks you can actually expect a child to give you social smile respond to the sound because after the age of three months only the basically gain their vision to they try to look around here and there give you a social smile respond to loud sounds like app clapping whistling in all these