Our favorite flats up to about 2 months, then they start to be a little small (origami fold). Edges are serged - no uncomfortable hem bulk for the little one. Do make sure to wash them a few times before use (as recommended for all flats!). 2-3 washes at 60deg, then the first uses for “short use” diaper (not overnight!) broke them in well. Only thing to improve would be a cotton tag instead of polyester, but that’s easily solved by cutting out the tags :)