Try the Fisher Price Rock N Play sleeper! It's kind of an ugly contraption (like an angled bassinet), but has worked great for my 2 super spitters! We were terrified to let our DD sleep on her back when she was spitting up so much, and the RNP was a godsend (and again for DS!)!
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Mama to DD "A" 2/23/2010 and DS "L" 4/25/2012