Everyone is different, mine since the very first day!

Mine was two months but just like all milestones, it is different for everyone.

All are different. Mine didn't until she was 8 months. some do much sooner and some much later. My cousin's 2 yr old still doesn't.

my son was about 10 weeks when we got the go ahead from our dr, but he had surgery so he had to eat every 3 to 4 hours to make sure he was gaining weight properly