My DS is 3 months old and has had a cough for a week now, the last two days he has had a runny tummy (looks like someone is sneezing in his nappy) and as a result of the frequent stools a nappy rash. I've shrugged it off as its winter and just a cold as he is happy in himself and feeds more than usual but DH is worried. Is anyone else experiencing the same sort of symptoms? Or should I be seeing a GP today? 