Oh my goodness! My baby (who just turned one!) was breastfed only and I could not believe the smells that came out of his little behind, and he was only 1 month old when it started. I found that frequency of BM's directly correlated to the gas. If he took an antibiotic, which normally would cause diarrhea but in his case made him actually poop daily (he would go 7-10 days between BM's), he did not have gas. However, when he would only go 1x week, horrible gas. My doctor was not concerned either since he was breastfed, but he would act really uncomfortable after not going for 3-4 days so my doctor said I could try giving him dark Karo syrup. He recommended putting it in a bottle and mix with the breastmilk, but he wouldn't take a bottle. I would dilute about 1 tbls of syrup in water, just to thin it out, and squirted down him with a medicine syringe. Once he started cereal, which your baby is old enough now, I put a large dollop of syrup in his cereal every night, and it did the trick. It works because of the fiber in the syrup, and he would go every 1-3 days instead of every 7-10 days, he acted much more comfortable, and no stinky gas!