Re: how long in each size?
Not a dumb question at all! My ds stayed in smalls until about 3-4 months old and then switched to mediums where he still is at 11 months and will be there for awhile. Of course it does depend on the dipe....for example, I expect him to never get out of medium FB as he is still on the smallest settings, but he is in a large Magicall. I think mediums last a long while as I briefly CD'd my ds#2 last year at age 2.5 and he also wore a lot of mediums!