Character.com sizing?

[Pigleychez]

I maybe being dumb but I cant seem to find a sizing guide online to see what size will best suit the DD's?

Anyone bought from them before and know about their sizing?

I recently ordered from Character.com and was very unimpressed. The onesies I got were a very thin material and cheap looking.

I ordered size 4-5 which looked about right and size 18-24 months which looked very large.