My daughter is 11 weeks old and she does very similar things. There may be something wrong, possibly not. I cannot say for sure. I was also concerned and changed what I ate, changed her formula to soy and tried three different other formulas. Nothing seemed to help. Make sure she is not sucking in too much air when she is feeding and warm the formula up. Gripe water also helps with my baby and sitting her up more during feedings may help also. I don't know what else to say. Hope this helps some. If you're concerned you're doing the right thing by getting help from a physician.