I was told 2nd child is a fast boomer, they love to imitate and will do so upon watching other kids especially what their eldest are doing! I mean that's how it was with my 1st born...regardless of all my attempts along with his day care teachers he just wouldn't show any encouraging signs! Till that summer when he was almost 2 years and 4 month and he saw his best friend wearing a cool underwear and at that moment he demanded to take off his diapers!!
However, my daughter was a totally different story!!