'It's not up to me to decide for my child.'
It is until they are deemed able under a prescribed scale of consciousness .
I threw up questions before consenting my daughter to her second round of chemo. Only questions. They were enough to throw off the junior sent to consent me.
Her consultant was quick to call me in and start in on legalities, of which she knew little. I listened, then told her I was not here to refuse, and affirm the witness as such, because any court of law would quickly overrule me, quite rightly, but only to pose questions. That court of law would allow my questions, via my appointed counsel, but that it would be a very tragic waste of time; it would be better they were answered then and there, and treatment to procede, for I knew my child without treatment would die quickly. And then when she answered them I dicated a paragraph for her to write and both of us to sign, as full and informed consent, because only she could write in those notes without formal leave.
It is entirely up to you and your team of consultants to decide for your child. Where there is disagreement, there is court. It is worthwhile to instead speak with the team at whatever length you can to decide.
But in the case of children I have not met consultants, and I have met very cold ones, who are in the business of proposing organ donation where every other possiblity for that child to live has not been exhausted.
Again, that is just my experience, and I have had some consultants whose manner was such I did not want them near my daughter when she died. But it was not their clinical skills I found lacking, and I was not shy in making that known to them.