When do babies start smiling and laughing?

A baby’s first social smile usually appears by the end of the second month, according to the AAP. On the CDC’s checklists, most babies chuckle by 4 months and laugh by 6 months.

Checked against CDC and AAP guidance on October 12, 2026

First smiles

Grins in the first month are often random, and can be a response to something like gas or hunger. By the second month, they begin to turn into real signals of pleasure and friendliness.

The CDC’s checklist at 2 months includes smiling when you talk to or smile at your baby. By 4 months, it includes smiling on their own to get your attention.

First laughs

The CDC’s checklist at 4 months includes a chuckle, not yet a full laugh, when you try to make your baby laugh. Laughing is on its 6 month checklist, and by 9 months it includes smiling or laughing during peek-a-boo.

What can help

Smile back, talk and sing to your baby. Smiling soon becomes a back-and-forth “conversation”, so answer their smiles quickly and with enthusiasm. You won’t spoil a baby by responding.

Sources

This guide is for information only and is based on CDC and AAP guidance. It isn’t medical advice and doesn’t replace a doctor. Guidance can differ between countries, so follow your doctor’s advice and your local health service. If you have any concern about your baby’s health, always contact your doctor. In an emergency, call your local emergency number. Babies develop at their own pace. If you’re worried about your baby’s development, contact your pediatrician.