No, these nursing pillows are not designed to let the baby sleep on them. Perhaps, there is a warning from the U.S. Consumer Product Safety Commission, suggesting to not let the babies sleep on these nursing pillows as they could be dangerous for the kids, comparing the items it can pose. This is because if the baby is let to sleep in a nursing pillow or a lounger, they could slide down resulting in a neck bend that could also block their airway.