My little guy is 3 months old, i am only breastfeeding him. today he woke up i feed him lying down, burped him then switched sides and feed him some more.....he went back to sleep and lillte milk came out of his mouth, i wiped it away.....half hour later he started to whine so i went to get him, as i picked him up he throw up milk only, white, it went flying out of his mouth. he did it 3 more times then i brought him to the bathroom and held him over the sink he throw up 2x more....he wasn't sreaming, but not happy. he throw up only once before, never like this.....why?? can anyone help?