| | Re: baby stretch headbands... what size?
For fold over elastic I would try 13 inches.
It is hard if you look on etsy and search you will see different sellers suggest different sizes for the same ages.
We should all try them out on our babies of different ages to see what sizes really work.
One average I sell
13 newborn to 3 months
14 - 3m - 6 months
15 - 3 months - approx. 8 months