My boys were/are chalk and cheese too Sarah. One slept through from 6 weeks, the other from 12 months (and he is now the better sleeper of the two by far, go figure!!). It came as a huge shock to me to find out how different T is to J. I wasn't expecting it at all. It's great to have two such different kids and I think it's better that way so they aren't competing in the same areas as such, but each doing different things, but in some ways it is like being a parent for the first time again LOL!