I had to supplement today with one bottle of formula because I had to be away from the baby and didn't have any milk already pumped
She's never had formula before, ever, and she is 8 weeks old.
Now she has a rash on her chin--she had a little bit of baby acne starting to sprout there a few days ago but today it seems to be much worse. She's not covered in red splotches, but it's definitely much more noticble.
Could this be an allergic reaction or does this sound like normal skin troubles at her age?