My 9 week old has been very fussy for the last couple of days. I believe she is allergic to dairy since she got fussy and with an upset stomach 3 days ago after I ate sour cream. She has been refusing her bottle ( breast milk) and today she vomited right after nap and has had 3 poops in the last 4 hours. I need advise! Should I call her doctor or is this happening due to her milk allergy. Thank you for your answers.