Baby has been spitting up a lot more than usual, and today has begun kind of “smacking” when sucking on her bottles nipples. She is still using newborn slowflow nipples we received from the hospital, but I’m beginning to wonder if she may be smacking and it causes her to get air while eating her bottle, which would make her spit up more? Do I need to increase the nipple size on her bottles or should I just take her to doctor about her spitting up + smacking is normal? First time mom!