I'm probably worrying about nothing, but...
My six month old grins at me (when I smile at her or when we play) and makes pleasurable squealy noises but I have never heard her laugh.
I'm not usually that bothered by these so-called milestones (she's not rolling either but she's huge so I figure she's likely to be late with that, she pulls herself over with the help of her baby gym) - but the fact she seems to be so late with laughing is bothering me a bit.
Any thoughts?