K.J.
My son did the same thing right from the first breastfeeding. When he was six months old we had him tested for allergies and he was allergic to the food I was eating while he was breastfeeding. They found he was allergic to milk, eggs, soy, and oats. We changed my diet and all has been well since. He is now 2.5. It took forever for the pediatrician to agree to have him tested. Why?: I don't know...but we are due to have another child and if he/she has the same issue, I am going to request testing immediately. Good luck.