When do newborns start to laugh?

I’m just curious because I’ve heard babies sit up at 3 months. Mine is 3.5 months, and I’m getting impatient. I’m not worried and know every baby is different, but I’m interested in other babies’ experiences. Thanks!

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Our baby took 4 months to start sitting upright so no need to worry

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Hallo everyone, newborn babies usually start smiling within the first few weeks of life, which may begin as early as 6 to 8 weeks. However, the babies true laughter usually begins to emerge around 3 to 4 months of age. At this stage, babies are more responsive to stimuli and interactions, which can lead to genuine laughter in response to playful and amusing situations.

Giggles at 8 weeks, full belly laughing at 12-13 weeks.

Do you have any tips for engaging with a baby to encourage those early smiles and laughs?