Quick Answer
Most babies laugh for the first time between 3 and 4 months of age. Laughter builds on the social smile, which typically emerges at 6 to 8 weeks, and develops as your baby's brain becomes more capable of processing delight, surprise, and social connection. Every baby is different — some laugh earlier, some a little later — but by 4 to 5 months most babies are laughing regularly.
How Laughter Develops
- 6 to 8 weeks: The social smile arrives — your baby's first deliberate expression of joy in response to you
- 2 to 3 months: Smiling becomes more frequent and is accompanied by cooing and vocalising. You may notice your baby making sounds that are almost — but not quite — laughter
- 3 to 4 months: True laughter emerges. It is often triggered by physical sensations first — gentle tickling, blowing raspberries on the tummy, or being lifted and swooped. The first laughs may be a single chuckle or a breathy giggle
- 4 to 6 months: Laughter becomes more frequent and easier to elicit. Your baby begins to laugh at social games, funny faces, and surprising sounds as well as physical play
- 6 to 9 months: Your baby develops a clear sense of humour. They begin to find specific things reliably funny — and may even try to make you laugh in return
What Makes Babies Laugh
In the early months, laughter is most reliably triggered by:
- Physical sensations: Gentle tickling, blowing raspberries, being lifted and swooped, or bouncing on a knee are among the most reliable early laugh triggers
- Surprise and anticipation: Peekaboo, "I'm going to get you", and other games that build anticipation and then deliver a surprise are highly effective from around 4 to 5 months
- Funny faces and sounds: Exaggerated expressions, silly voices, and unexpected noises delight babies from around 3 to 4 months
- Your laughter: Babies are highly attuned to their caregivers' emotional states. If you laugh, your baby is more likely to laugh too
Why Laughter Matters
Laughter is far more than a charming milestone. It signals that your baby's brain is developing the capacity for joy, social connection, and the processing of surprise and incongruity — all of which are foundational to cognitive and emotional development. The back-and-forth of making each other laugh is also one of the earliest forms of true social play, building the skills your baby will use in all future relationships.
How to Encourage Laughter
- Play physical games: Gentle tickling, raspberries, and swooping are reliable laugh triggers in the early months
- Build anticipation: Slow, exaggerated build-up before a surprise — "I’m going to get you… I’m going to get you…" — is often funnier to babies than the surprise itself
- Be silly: Funny faces, unexpected sounds, and exaggerated expressions are highly effective. Do not be afraid to look ridiculous
- Follow your baby’s lead: Pay attention to what makes your baby smile and build on it. Every baby has their own sense of humour
When It's Worth Checking In With Your Pediatrician
Speak to your pediatrician if:
- Your baby has not smiled socially by 3 months
- Your baby has not laughed or made any joyful vocalisations by 5 to 6 months
- Smiling or laughter appears and then disappears or regresses
- You have any concerns about your baby’s social responsiveness or emotional development
Key Takeaway
Most babies laugh for the first time between 3 and 4 months, building on the social smile that arrives at 6 to 8 weeks. Physical play, anticipation games, and silly faces are the most reliable triggers. Laughter is a significant developmental milestone — and one of the greatest rewards of the early months of parenthood.
Parents Also Ask
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This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your pediatrician or a qualified healthcare provider with questions about your baby’s health.