as we all know , you be suppose to put you baby to sleep on he back to help prevent sid . the SleepSack be a great product ! it keep baby nice and warm , yet you do not have to worry about a blanket . and there be space down in the bottom for he foot so he be not too restricted . also , the great thing be that it zip from top to bottom , so you do not have a big zipper poke baby in the face .