Babies are not supposed to sleep with blankets or toys in their cribs. For young babies, these objects can pose a suffocation threat (poo poo poo), and for older babies, they can give the baby a leg-up to help him/her climb out of the crib. Therefore, what do you do with baby on a cold winter's night, or even in the summer, when a pair of regular pajamas isn't enough to keep baby warm?
We've mentioned the Grobag Baby Sleeping Bags here on this site, and that's a great option if it's really warm in the nursery or if your baby is wearing really warm pajamas underneath, among other layers. But it's not really a replacement for a warm blanket.
The following sleep sacks, or "wearable blankets," are cozy, long-sleeved baby sleeping bags that, with a pair of pajamas underneath, will keep your baby warm (and sleeping better) without using a blanket. The sleeveless ones really just don't make so much sense to me.
1. Just One Year (Joy) SleepBags - Midweight fabric.
2. Summer Infant Slumbersack - Lightweight microfleece.
3. Safe Dreams Wearable Blanket, by HALO - Fleece. (This one comes in an X-Large size (18-24 months), which is as big as you'll find it.)