My ex husband sent me a message asking me about my daughter’s underwear and if she has started her period.

I didn’t tell him about her period (she’s 11 and just had her first one) because she asked me not to. I did encourage her to talk with him when she felt ready because I do try to be a good co-parent. In the meantime, I bought extras of all the period supplies she needed/requeated so she could have some at both homes.

AITA for not telling him and thinking her period is none of his business?