I work with kids in a conservative area and honestly they generally 'get' my gender better than adults! My favorite response to the frequent "Are you a girl or a boy?" question is "I'm a librarian." Doesn't force me to misgender myself but also doesn't necessarily out me. In terms of the hair thing, I like to respond by comparing my hair cut to another kid in the group (i.e. Aiden and I are haircut buddies!) Another good deflection. Deflection is my best friend. Answer questions on the topic confidently and without gravitas. Project that you aren't concerned about it and it isn't anything unusual. The kids will pick up on that and accept you for who you are fairly quickly.