My DD went into sleeping bags at about 8 weeks, before then she wanted to be wrapped. At the moment, she's in a 2.5 TOG and is also wearing pajamas inside it. I'm not sure about the bottom though, I guess just fold it over, my DD sleeps in the middle of the cot. She doesn't have any blankets but I do have a heater set on low in her room overnight. I love the sleeping bags- so easy as DD moves around a lot during the night so it means I don't have to worry about her pulling blankets etc over her head.