I used these and other similar ones I found on Amazon when my daughter was little and had kind of wispy, uneven hair that would get in her eyes. Other brands were GBATERI and Shemay. I found the 2-2.5" ones worked well at that age.
https://www.amazon.com/gp/product/B01IEUHR2G/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1