B.C.
My daughter spit up a LOT, too, and we were afraid to lay her flat that she would choke on her spit-up. She slept in one of the vibrating beds for months! I would snap the little belt around her & she never rolled out & slept really well, plus she was upright a bit, so we didn't worry as much about the spitting up. Eventually, we tried propping up the mattress at one end, but that didn't seem to work that well for her, but others say it worked for them. I had one of the little sleeping wedges that would help her stay on her side & that worked some, but mostly I didn't push it. Just keep trying off & on! Good Luck!