Here is an outstanding piece that goes into more detail about exactly what is wrong with the UN Convention on the Rights of the Child.
I will not elaborate but urge you to go now and check this out. You may be shocked to realize how any rights YOU have to direct the upbringing of your child will be affected. This is not only, as she says, about "Christians and nutty homeschoolers" who oppose this. If you are a parent, you should oppose this.
Contact your legislators immediately.