if you wanted to leave a message to your kids that they wouldn't get for many years. Something like I have a retirement account for you, here's where to find the info. The idea is to keep them from spending it before it increases in value. How would you do it?
If you go this route, pick the caretaker carefully. I have a client whose grandfather set up a trust for her when she was young. Some years the K-1s showed no income at all, due to the fees charged by the lawyers administering the trust eating up all of the income. It DOES NOT take much effort nor time when all the funds are in a brokerage account. She finally got it when she turned 40.
