My dd at 22 months has almost grown out of the sleeping bag that was supposed to last until at least 24 months (she is 95th %ile height). Now I'm wondering whether and how to try and find a bigger one. Am in NZ where they are not common so am thinking I might make one! Any tips on how to get the right weight and what design feature are preferable? E.g zip on side or front? I have had a preference for the side zip as I think it is more comfortable (no risk of scratching under chin) but she has started to undo the poppers on the shoulders so maybe a front zip with no poppers would be better? Thanks!