we swaddle we baby from birth to about 3 month . he begin to associate the blanket with nap time or bedtime . when he begin roll over , we need a non-swaddling blanket option that would give he the same sleep cue . the HALO sleepsack work great . it be soft and roomy , but we do not worry about he end up with the blanket over he face or in he mouth . the zipper open up from the bottom , which mean there be no uncomfortable zipper up by he chest . there be plenty of grow room -- he be now 7 mo , and still fit in the sleep sack with room to spare . the tag on the back be scratchy , but that can easily be take out .