My poor 17 month old bub has a really red raw bottom. He's had a little bit of diarrhea, and may be teething. His poor bottom looks really sore, and he's been crying when i wipe, and when i touch it 😕 even in the bath tonight. What's the absolute best nappy cream out there that might help heal it, and provide a barrier? We have Sudocrem - is there anything better?