I have what I am certain to be mastitis, have had before when DS breastfed and now feeding DD. Awaiting GP appointment this afternoon for antibiotics as getting worse. Anyway, DD is vomiting after feeding on that side quite badly. I can't feel a lump to suggest a blockage but have read trauma can cause mastitis and DS and I were messing around at the weekend and he accidently headbutted my chest area (he's 3 for context). Can this cause a baby to vomit or is it more likely to be coincidence? I am currently dairy free as suspected allergy in DD if that makes at difference.