DH has convinced me to give camping a try, with our 2year old DS, in mid August. As total camping novice, have no idea what DS should sleep in (am assuming DH and I will take sleeping bag and pillow for us).. we'll be using a travel cot I think (to trap DS while we're busy doing other stuff if nothing else!) so would a blanket underneath, a 2.5 tog grobag and a blanket ontop be enough for him - or should I invest in a proper sleeping bag for him? Any advice from you experienced mumsnet campers would be most gratefully received.