Vomit... help me troubleshoot this child

jenkh2012

So a few times a week DD#2 vomits (like everything in her stomach... mucusy milk). Before she does it she seems very unsettled after a feeding. She often has some deep burps but after a few burps she still seems hungry so I put her back on the boob and feed her some more. She usually eats for about 5-10 minutes off one side only per feeding. I have lots of milk and my let down is quite intense most times. It's so hard to read her cues because she seems uncomfortable and I can't tell if she's gassy or still hungry. After she does it she's very calm and relaxed. 

Anyone else experience this? Not sure if this is normal as their stomaches are still getting used to digesting everything?