Back is best?

Kait

I know that back is best for sleep, but a few times now my baby has spit up in her sleep and a couple of times it has woken her up sort of choking her. Or at least making me believe that she inhaled some and then she sort of coughs. But she was in a lot of pain just now. She had just spit up on her self in her sleep. What am I supposed to do with that?