For me, everything except ETFs for the child is a gamble with his money. I did the same for mine with 1 Nvidia. It's gone well so far, but I shouldn't have done it because it's simply not my money. This is meant to be unbiased and is just my opinion.
@Johann_van_der_Smut Well, strictly speaking, it's my money. I could also call the deposit something else. But the plan is that he'll get it at some point