At what age do babies start laughing?

Mine first laughed around three months, but she didn't do it consistently until about five months.
 
Every baby is different but my son started giggling around 3.5 months and does it all the time :D
 
Mine giggled at 5 weeks even though people tell me it isn't possible. I didn't have a video camera at the time but I have many pictures of those smiles.
 
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