Rash on one month old

laynee *

My one month old has developed what looks like a rash, he did just get switched to sensitive formula for what his dr thinks is a milk allergy so not sure if it’s just his body adjusting or if it’s maybe eczema/baby acne type stuff… he is fine otherwise doesn’t seem upset or fussy no fever etc, was planning to call his dr when they open Monday bht wanted an opinion