Avoid "The Baby's Catalogue", Janet and Allen Ahlberg, the page entitled 'accidents'. Very charming, funny picture of a baby falling into a toilet in the bottom right hand corner. Hadn't looked at this book for ages - when DS produced it. "Oh no DS, thats a silly picture, ofcourse that baby isn't falling down the toilet". Looking back, maybe I subliminally planted the idea of falling into the toilet in DS's mind by reading this book when he was about 18 months old...?