E.R.
Hi S.
I use bumgenius onesize pockets and some BG sized AIOs for my tall skinny 18mo and I find they work and fit great. I will admit I still use sponies for overnight. I found I had to buy about a dozen and that generally gets me through 2 days. I do a wash every other day. The AIO take longer to dry but are super easy to use. The one-size will handle just about anything you can throw at them. I do use liners (flushable rice-paper-like sheets) that make dealing with pop eminently more bearable (almost as easy as sposies). Good luck with it.