When Do Babies Start Laughing? What to Expect at 3–6 Months

If you thought the first smile was something, wait until the first laugh. That full-body, gummy, sometimes-surprised-at-itself giggle is one of the greatest sounds in early parenthood.

When does the first laugh happen?

Most babies produce their first proper laugh between 3 and 4 months of age. Some are as early as 2.5 months; some don't arrive until closer to 5 months. Like all milestones, there's a wide range of normal.

The 3–4 month period is when babies' social awareness really takes off. They're alert for longer stretches, more responsive to faces and voices, and actively looking for interaction — all the ingredients for laughter.

What triggers a baby's first laughs?

Early laughs tend to come from physical and social stimulation — not yet from jokes or visual humour:

• Raspberries on the tummy — the original classic
• Silly faces — exaggerated expressions, especially mouths wide open
• Unexpected movements — popping up from behind a blanket (proto-peekaboo)
• Voice changes — sudden high or low sounds, animal noises
• Light tickling — neck, ribs, inner arms (watch for overwhelm — some babies don't like tickling)
• Being lifted or small safe drops
• Your laughter — babies find laughing faces funny even at this age

Why do babies laugh?

Laughter in babies is social and communicative. It signals enjoyment, connection, and safety. When your baby laughs at something you do, they're telling you: I like this, do it again — one of the earliest forms of back-and-forth conversation.

Laughter also signals that the brain is processing expectations and surprises — the basis of all humour throughout life. Even at 3–4 months, your baby is building a sense of how the world works and finding it funny when things are playfully unexpected.

How laughter develops from 3–12 months

3–4 months: First laughs — usually at physical stimulation and exaggerated social games

4–6 months: Laughs become more frequent; baby can "perform" — repeating something that made someone laugh

6–9 months: Social games like peekaboo become reliably funny; laughter at others' laughter

9–12 months: Babies start to initiate games and actions specifically to get a reaction — the first signs of playful humour

Encourage laughter with serve-and-return play

The pattern: you do something, baby responds (laughs, smiles, vocalises), you respond to that. Then repeat. This back-and-forth — even a simple silly face — is enormously valuable for brain development, language, and bonding.

Watch for these cues during play:

• Turning away or looking down = needs a pause
• Arching back or fussing = overstimulated, stop
• Widening eyes, wriggling, vocalising = enjoying it, keep going

When to mention it to a doctor

Most babies laugh by 5 months. If your baby isn't laughing or isn't showing other signs of social engagement (smiling, making eye contact, responding to your voice) by this point, mention it at your next health visitor appointment. It's usually nothing to worry about — but social milestones are worth flagging early.

Record it

A baby laugh is something you'll want to hear again at 3am on a hard night, and again when they're 18. Use TinyYears to capture the first one — video is even better.