TO be honest I ahve no idea what SIDS recommends in this but we have had DD on hers since about 7 1/2 months - she's 10 months now. I don't see an issue as she can roll and move her head easily but also it's not too fluffy IYKWIM - she doesn't sink into it like she might a big loose blanket or teddy. Be interested to see though! hmm feeling bit guilty right now!