we baby be swaddle for sleep up until she be 6-months-old and start roll over onto she stomach while swaddle . we try put she in footie pajamas for sleep , but she seem a bit restless during the night . it be too drastic of a change from the swaddle she have become comfortable with . we try this halo sleepsack -lrb- on top of the pajamas -rrb- , and she settle right down to sleep . the SleepSack give she the cosy comfort of a swaddle with the freedom to roll over without any safety issue . now we use a sleepsack every night . we prefer the standard fabric -lrb- rather than the fleece variety -rrb- . live in Houston , the Halo fleece fabric be too heavy and warm , even in winter . this particular design of dot be not we favorite Halo design , but it work just the same as the cuter design .