Hi Denise, Has the baby just regurged the breastmilk since being given formula? Was it after mom had gone a long time between breastfeeds and breasts were excessively full so baby gulped a lot? Maybe took in a lot of air - hence spit it back up because of that and took in too much at a time too quickly. I'd ask her if she was limiting time on first side to go to second side as well.... Your idea about "Ask me about Lactnet" is a good one. We could put it on our name tags! Jan ([log in to unmask])