I certainly noticed the jump from two to three more than i did from one to two and more than i did from three to four. I think it was more that when my husband and I would go out it wasnt just one each any more..it seemed that if I was tending to bubs..the two others would get into mischief together lol. Having said that though..i loved it and wouldnt change it for the world. We had 26months difference between one and two and 30 months difference between two and three. Goodluck with your decision.

Jo