I've just got DS into sleeping bags but I think he might be a bit of cold frog because he keeps waking up around 4/5am freezing cold. He's in a 1 TOG with full onesie, socks, and singlet underneath, but this isn't cutting it. I've put him in a much thicker sleeping bag too (with no TOG rating) but he isn't warm enough in that either. I've tried mittens or onesies with hand coverings but he sticks his hands in his mouth and makes them soggy, so that doesn't help.
His little hands are like ice blocks when he wakes, I end up sticking blankets over him but I find that still doesn't warm up the top half of him. Should he go into a 2.5? I thought they were just for winter?