Well, I don't know if this will help, but I am a 25 yr old mom of 4, a 4 yr old, almost 3 yr old, and 5 mo old twins. My twins are getting VERY wormy, we have a cold house too and I have put a blanket on them, but recently, they've been moving so much and I checked on them once when they each had the blanket over their head, it freaked me out, so no more blankets, tucking them in didn't work either! So, they sleep in the onsees with feet, and they're arms and legs get stuck where they shouldn't be too, but it keeps them warm. An idea I had was to use the ones without feet and put them in those warm little tights (not pantihose), they stay in place and will keep their legs and feet nice and toasty. Let me know how it worked for you! My husband may not like our little man in those, but we'll see!!!:)