I've scrolled through all the pages and not seen this advice yet so I'll offer it - with my two (now aged 9 and 6) I was taught 'feet to foot'. In other words, make up the crib towards the foot of the bed with the blanket, quilt or whatever tucked under only at the bottom, NOT at the sides. That way they can't pull it over them or wiggle under and air can still circulate. The problem with quilts rather than sheets and blankets is they are thick so I'd say use a lightweight pure cotton batting, NOT polyester under any circumstances as it doesn't 'breathe'. I also used a room thermometer and adjusted the bedding accordingly - cool is better than too warm. These days, houses are better insulated and often over-heated so this is more of a problem than in the days before central heating. My mother's brother died of SIDS over 60 years ago - times change, research improves, yes, we all survived but there are those who didn't...