... that's the equivalent warmth to a sleeping bag (i.e. worn over PJs and replaces a blanket) for a 9 month old? As he's just pulling himself to standing in the cot, his sleeping bag is now a nightmare as he gets his feet tangled in it and falls over, crashing into the cot bars! And no chance of getting him to stay under a blanket! So I need some sort of thick outer sleepsuit, with feet so he can't get caught up in it, iyswim.