M.B.
Show the rash to you baby's dr. My daughter kept getting rashes and it was a yeast infection. She didn't get it till she was older because it was caused by the apple juice and apple sauce she was eating that she didn't get when she was a baby. It made her urine more acidic and broke her skin down and made it susciptable to yeast infections. The rash was raised red pimple like bumps. Good luck!