I always feel the baby's move pretty early..around 14-16 weeks. But it's so light and fluttery at first. I only noticed it in the evening when relaxing watching tv or after eating/drinking (esp milk). And you can go 3 days and feel nothing! For some reason, week 17, this baby has become more active. I do believe, the thinner you are the easier/earlier you will feel the baby too. And you have to be able to distinguish between gas and the baby. It's a skill to learn hehe. Bub always kicked in the same spot early on..so i knew it was the baby. I do notice when I have a really busy day on my feet, it's like the baby was rocked to sleep.