Without asking? I think if someone were to ask, and I were ok with it, that would be one thing. If they did an important milestone with LO without asking I would be hurt. My MIL decided to take it upon herself and cut my two year old nieces hair, by herself, without asking. Not only did she take that special moment away but the hair cut isn't great whatsoever. I can't believe she would do such a thing, I'm so glad it wasn't my LO but feel so bad that milestone was taken away from them.
How would you feel? Or how would you react to something like that? Are there certain milestones or firsts you absolutely do not want someone to take away? Are there some you would be ok with letting someone else experience with your LO?