<s>[INST] My 4 month old is always in pain an discomfort crying and windy. Also vomiting up milk but still gaining weight he is not reflux or lactose as both has been changed and no major difference for him. Under his ribs in middle feels hard could this be hernia? I can feel what I can only describe has a bubble going in and out when he is in pain or winding him which feels like it s moving in and out on his upper abdomen. But can t see anything swollen on outside [/INST] Hi...Thank you for consulting in Health Care magic.This is called evening colic and is quite common in this age group. This happens when the baby sucks at the breast very fast and in eagerness to drink milk will gulp in air too. Unless the air comes out like burping or flatus this discomfort will be there and next time check if she is sucking too fast and gulping in air too. You will be more convinced. Usually I don't advice any medicines for this as they give only temporary relief.Hope my answer was helpful for you.  I am happy to help any time. Further clarifications and consultations on Health care magic are welcome. If you do not have any clarifications, you can close the discussion and rate the answer. Wish your kid good health.Dr. Sumanth MBBS., DCH., DNB (Paed)., </s>