Here are the little kids’ sizes:
Eli — shirts size 6 kids…the 5Ts are starting to fit a little too well so a size or two up should hold him for a while.
pants — 4T or 5T. Lightweight pants that have lining or “soft pants” (AKA, sweat pant type material) would be good. He’s got a lot of jeans.
hats– adult one size fits all.
Ben — He’s in six month clothing now so probably 9-12 month clothing or anything larger, he’ll fit into it eventually. For any hats, the 2T is slightly too large but still fits him ok.
I did make Amazon wishlists for them.