nurturally baby anti roll support - safe breathable fabric for babies age 3 to 6 months old, designed in usa (sleep sack not included) chrome cherry the nurturally anti roll support patented design has been developed to keep babies in the preferred back position. the nurturally anti roll support is suitable from when the baby can roll from a position on his back to his front, but can't yet naturally roll back (from 3 to 6 months old). always to be used under adult supervision.