I'm curious how the OP stored the Bitcoin they bought for the baby, they created a paper wallet? Bought a hardware wallet or any software Bitcoin wallet? It would be more amazing for OP to share how they manage to store the Bitcoin so just in case in the future, other will follow it too.
Just like me, I am planning to do it in the future for my children. Since I saw a lot of people having life insurance to their children while at very young age, so for me, I will do like what OP did.
Because this is for the long term then he should be able to control his own at least a non-custodial wallet or better a hardware wallet will be much more secure especially the dozens of years that are planned to invest in bitcoin, if what is entrusted is an exchange then that is a big mistake because after all we don't know about the future exchanges there might be a lot of collapses because of the uncertainty.
Actually this is a good plan where he has thought about children in the future while we always believe that in the next decades bitcoin will be even higher because of limited supply and also a lot of demand because the community is large, I have to think about this as early as possible how there must be investment savings in bitcoin for my child later.
Although I'm still building my bitcoin portfolio on a regular basis I will have to differentiate bitcoins for me later.