When did your babies start cooing/making sounds? My baby just turned 3 months last week, and we really don't hear much out of her except for some loud 'yelling' every once in a while and a cough sound here or there when she laughs. When I look in those darn milestones books, it says this should happen by 2-3 months. Ease my fears! This is my second, and my first child was cooing up a storm by this age.