DS (19 weeks) has recently developed nappy rash around the edges of the nappy (inside of his legs, between his penis and his bellybotton) but not anywhere else. I'm not sure whether to try the usual nappy rash remedies as nappy rash usually seems to be around the bottom. Could he be having a reaction to the nappies? We've been using pampers since he was born, but have recently moved up a size.