DS has just turned 17 months and isn't walking yet. He is a very speedy crawler, crawls up and down stairs at speed, climbs onto furniture and cruises a lot but just isn't walking. He is at a very good nursery who say there is no need to worry as he is very steady on his legs when standing and cruising and clearly is just enjoying crawling. Otherwise his development seems normal too - chats away, very good understanding, good motor skills otherwise (eg. very good at building towers). I have to admit that I'm beginning to obsess about it though. Other people keep seeming shocked that he isn't walking yet and I'm terrified that there is something wrong.