My boss forwarded this link to me just a little while ago.
Per Haley's pedi recommendation, we used a sleep positioner with Haley bc of her reflux (along with having the head of her mattress raised). We use one now with Ashlyn too since she's got reflux just as bad as Haley had. We've talked about taking it out of her crib since she rolls to her back anyway. Now that this has come out, I think we'll try without it tonight.