Glad to see that you are planning in so advance for your child. IMO, you should buy such a plan which accumulates enough cash when your child turns 18. That money will help you in funding your child's education or his/her future marriage. Along with that, you should also ensure that, God forbid, but in your sudden absence, your child's future is protected. So, go ahead with a child ULIP plan for your child along with a 'waiver of premium benefit rider'.
If you have any further doubts, post them here again.