Hi, my little boy is 2yrs 5months and will not sleep under his duvet resulting in cold legs as his pj bottoms ride up! He was in Grobags til a few months ago so has yet to grasp the concept of sleeping one end of the bed under the ducet. I have managed to get some fleece sleepsuits in size 3-4 (he is quite tall!) but cant find any just cotton ones for until its really cold enough for the fleece, help? Thanks x