Preemie mittens

With my first child I could never keep the 0-3 mittens on her. I finally found some “newborn” mittens and they worked beautifully... and NOW I’ll never be able to find some for my son. (3 years later) I know that a 0-3 will be too easy for him to get off.

Any ideas?

Edit: found my daughters mittens and baby brother will just have to deal for a bit. We live in Hawaii and I can’t buy only sleepers and shirts with mittens built in as 1) I can’t find them and 2) it’s so expensive here. 😣

I may try to find some online though they are child of mine brand.