Hey, As a mum we will always have this kind of feeling :) But rest assured that your baby is doing fine and the growing pace of very baby will be different so just enjoy these milestones and joyous journey :)
Never compare your LO to other babies .. every one of them is different . If they are hitting milestones , you doesn't need to be worried
every baby is different. I think don't stress yourself or baby. as long as they can hit milestone will do