My LO barely laughed either... Then on the rare occassion you did get her to laugh, two seconds later, she's over it. But the older she got, the more smiley she is and the more she laughs. Now at 8m.... When she feels like it, she'll start chuckling away.... But only when she feels like it. She's very content though, and everyone always comment on what a happy and good baby she is...but giggling? Only if she finds you very funny... And boy do I still have to work at them.