How to give Bitcoin to kids?

So here's my question? I see a lot of people gifting there kids Bitcoin because in 20 years the likelihood that it will be worth substantially more is pretty good. I have a small stack less than .5 I dca'd on robinhood (since moved to cold storage)and my son has .04 on coin base and my daughter who was just born 2 weeks ago doesn't have any yet. I was curious how I go about setting it up for them? Because they are all under my name? So what do you do? Just have the tax forms under your name and "gift" it to them, or how do you make an account for them? Is it too late to make a separate account? I thought they have to be 18.. thank you!