When will my baby smile for the first time?

I caught my baby's smile when she/he was sleeping during Day 1. Neonatal smiling occurs from birth to one month of age and shows no emotional content. Smiles are spontaneous and often occur while the baby is drowsy or during REM stages of sleep. Baby smiles are subcortical in origin and will actually decrease with maturity (so premature babies smile more than full-term babies). And, contrary to popular belief, baby smiles have nothing to do with gas. - See more at: http://www.justthefactsbaby.com/baby/article/why-babies-smile-92#sthash.qiHKSYo1.dpuf If you are talking about baby's social smile, it will be around 4-8 months old when baby can see more clearly and more alert to response to you.