... if your child had done something wrong, had been told off by a stranger and the childminder...

[NotmyELFtoday]

would you still dicipline them yourself?

DD is going to be four in October, so she (in my eyes) is perfectly aware that what she did today was wrong, and while I was perfectly aware that DD had been told off by a stranger and the childminder, I still told her off when I found out what she had done.

WWYD in that situation - comment on it, tell them off, or ignore it given that its already been done twice?

DD, by the way, had hit the 9mth old mindee on the head with a toy that she likes to take everywhere with her. I have conficated said toy and told her she is not allowed it back until tomorrow night.

By discipline, do you mean punish? If so, then no - but I don't punish anyway. I would comment though, or at least have a conversation about it.

No, I wouldn't. It's unfair, especially at her age - things need to be addressed as they happen, and only once, not keep coming back every time there's a change of adult in charge.

I would probably mention it in bedtime chat and just gently reinforce the message that she needs to be more careful though.

No. It confuses the child and potentially undermines the childminder -- the implication is that you don't think she is disciplining your child appropriately.
If DH were looking after the DCs and had imposed some consequence on them I wouldn't come home and punish them again. Childminders or nursery staff are in loco parentis so to my mind the same principle applies.

I do talk through with DS things that have happened at nursery so "Joanna said that you weren't listening at circle time today and shouted at her", possibly followed by "can you tell me about that?", then "I expect you to listen when you are at nursery. Tomorrow when I ask Joanna I would like to hear that you have been listening really well." and then a reminder the next morning. Unless the nursery staff actually wanted me to do something about it (other than talking) at home, that is but that's never happened yet.

Sorry, to expand, the childminder told me what had happened in front of dd, and said that dd had hit the other girl with the toy. So I said that she is not allowed to take the toy tomorrow. She's had the toy this evening, but she knows she wont be able to take it to the cm tomorrow. So my conficated it was a bit harsh compared to what I have done.

I reinforced the message with her when we were on the way home, chatting about how she doesnt like it if the other children hit her around the head etc, and that she should be more careful with the baby (dd used to be the youngest, whereas shes now in the middle range and so lots of younger children there).

TBH, it sounds like you handled it well imo.

Would just leave it at that now and move on.

Hopefully tomorrow will be better.

Now you explain it more fully, I think what you did was pretty reasonable.

Phew, thought I was being the wicked witch then!
She'll be going to toddlers tomorrow so she'll be letting some steam off there!

Agree with MIAOnline. I would have done the same.