Thanks everyone, I didn't really think he was dehydrated since he was having 8 wet cloth nappies within about 8 hours plus feeding well, but it is good to hear that others have the same thing. Now that you both have mentioned it (Cailin and Lisa) I have noticed that it only dips in a little when he is upright but as soon as he lays down it is fine. How odd as I never noticed with DS#1 as his fontanelle was so small, (the doc said due to being way overdue) and DS#2's was huge (the doc said due to being premmy) but never dipped in either. I am more at ease now! Thanks Kirsty for that info too, you have made me think to do a first aid course now, so thanks for the inspiration!