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.
It differs from baby to baby. I've caught my son smiling in his sleep at about 6 weeks onwards but he only started smiling at me at about 4 months old. Now he's 6 months, he smiles the moment he sees me or his sister and it's so adorable!
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I agree with the others. There’s no exact timeline when your baby will smile. Keep a watch out and make sure you catch him/her smile in sleep or at you ❤️
Its not fixed. Some babies can smile one first day or some may take weeks. Try out different toys with different sounds. Some can trigger that
When she would want to communicate you, she may smile to express her feelings! And that can be anytime after birth.
thanks