4 year dd old put small toy in 18month old brother's mouth

[MissGueuze]

The baby is teething very slowly, only has 8 teeth so far and the next 4 appear to be slowly coming, he's back to shoving all things in his mouth, when he does we say no and remove the object if he doesn't stop. His 4 year old sister just tried to put a small toy in his mouth, he could have choked, we have to keep small objects out both of their reach because ds really is incessant. Somehow this small object passed us by. We've made dd put all the small toys in a box and put them away for a week until she can prove she's responsible enough to play with them. Does she need further punishment? I'm really pissed off with her but am I expecting too much of her? She said she wanted to hurt him (ds) but her dad may have put words in her mouth.

*Edited for typos

Wow. She is 4. That is still quite young. I wouldn't be leaving them unsupervised. Punishment seems quite extreme.

Their Dad was with them, he saw her so it and stopped her.

The punishment seems even more extreme in that case.

Why?

She was probably trying to help, if she saw that he was wanting to chew on things.
I don't think you should be punishing her.

At 18 months, she'll never get something into his mouth if he isn't happy with it.

Much better to explain to her about small things being dangerous in his mouth and if she sees him trying to put something small in his mouth to tell you or daddy/other grown up.
She'll then feel that she's looking after him and being "big" which will be much better for their relationship as well as not doing it again.

It’s too harsh because it’s much better to explain why, explain the consequences and forget about it. She only tried to put something in his mouth, she didn’t even succeed. Is there a reason you want to keep on punishing her after the event and what outcome do you want to achieve if you do?

We think she already knew it was wrong because we have said no and explained why things shouldn't go in either of their mouths over and over again, she can only play with certain things when he's napping because of the risk of him climbing up and getting something or something dropping on the floor. We have to mention it multiple times a day. She must have known it was wrong. The idea of the punishment was to ensure it doesn't happen again.