All custom "love" items are made to order! I will get them turned around within 7-10 days of ordering!
Our Model, Lex, is wearing 12-18M, and it is big on her, so I would say these run true to size. She is in 6-12M for most things but I sized up thinking for longevity! So order TTS for kids.
Unisex sweatshirt is also TTS. I sized up to a Medium for a more cozy fit and I love it, has plenty of room! Normally wear a small.