​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Baby girl is 4 months old any ideas what this could be. Dad thinks heat rash, I always keep her in sleepers, we CO SLEEP

Aurora