Often newborns smile in their sleep. But starting between 6 and 8 weeks of life, babies develop a "social smile" an intentional gesture of warmth meant just for you. This is an important milestone. Your pediatrician asks you whether you've seen your baby's grin at a two-month well-child visit.
A baby cannot taste salt until it is 4 months old.
Baby kneecaps don't show up in x-rays, but your baby does have kneecaps.
A baby could hear your voice and other sounds from about 23 weeks of pregnancy.
From birth to toilet training, a baby goes through an average of 7000 diaper changes.