A simple basic for babies and toddlers. Easy to make and easy to get on a small protesting human. All sorts of ways you can customize them.
Long or short sleeves.
Finished size 0-6 (6-12, 12-18, 18-24) months is 10 (103/4, 11 3/4, 12 1/4)"/25.5 (27.5, 30, 31) cm long at centre back.