First time around we had a June baby and I'm pretty sure we did just a short sleeve onesie or a light cotton sleeper and muslin swaddle during the newborn months. But this time DD2 is due in December. What do you dress a winter baby in for bed? We have two of those newborn cotton Halo sleep sacks that contain the arms that we never used last time. Would layering a onesie, cotton sleeper, and sleep sack be warm enough? We generally keep the house cool at night.