I think saving for your children is the best thing you can do obv... But with the child trust fund they have complete control of that money when they turn 18, you have no say in what happens with it.
I speak from experiance my mum saved 20,000 each for me and my brother, I was given acsess to 10,000 when I was 16/17 and I shit you not I spent it in 5 months on going clubbing, out for meals, and genral tat.
I have spoken to people who are planning on (or already have) put thousands of pounds into this account.
I understand that some 18 year olds will be grown up enough to use the money wisely but surly you would rather invest it in a high intrest account that you could control so they used it for things they really need (uni fees, car, deposit for a house ect.)