DS (4.5 months) currently sleeps in a cotton babygro and a summer grobag at night. In springtime we added a short sleeved vest under the babygro. I'm just looking at Winter sleeping bags. Do i need one with sleeves? Our flat can get a bit chilly (uninsulated outside walls and 3m high ceilings), so i wonder if he'd get cold without sleeves on his sleeping bag. Obviously we can put him in a long sleeved vest and fleecy babygro, but i'm still not sure.
Can anyone give me some advice?