My baby does the same when she has formula left on her too long. It irritates her skin. If you’re feeding yours formula that may be why and just remember to wipe down after every feeding. I have to and when I forget once or twice it shows because she’s back broke out in little red bumps all over her face and neck
@vanessarosales, they went away on there own but I would say if they continue I would definitely go to your pediatrician and see about allergies and what not