My baby girl gets mistaken as a boy as well, even when I put her in a pink dress! Horrible. If you don't mind preloved, you can join buying and selling groups on Facebook to look for cheap deals. I've bought very pretty headbands for $21 for 14 pieces, all preloved. Here are some places which sell headbands: H&M Baby Baby N Joy https://www.facebook.com/media/set/?set=a.1458819844357694.1073741847.1385706835002329&type=3 Precious Baby Boutique https://carousell.com/preciousbabyboutique/ It's not recommended for babies to wear headbands for too long though.
You can try Etsy -- they have really nice and unique home-made hair accesories for baby girls. https://www.etsy.com/sg-en/c/accessories/hair-accessories I was mistaken as a boy when I was growing up because I had two brothers and my hair didn't grow to its current thick state till very much later. I wore alot of girly sun hats and berets. Or you could be cheeky about this and have your little girl wear stuff like this:
An online friend of mine does really pretty headbands for girls. She has an online store but it's not active recently as she has her own business to manage on top of her very adorable daughter. You can view her instagram (@dear.raessa) and check with her if she can take in orders. Otherwise, taobao would be a good place to shop for accessories! Although it's easy to get carried away since everything is so cheap.
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thanks