Due a winter baby and I'm looking for a grobag for when they are 0-3 months, but all the ones we can see are giant! They also say "make sure they cant slip below the shoulders"...but a tiny baby will easily slip down in these things. Also there will be loads of fabric at the bottom so how do you do feet to foot? I dont want the worry and faff of a big blanket in the night either...am I missing something? What did you do?