That’s not how it always work with supercars. F8s are going for high $400s depending on your spec.
Question is whether it will be worth that in 18 years, when that child is a man. It won't even be half the value.
Once again because of how many they made and how unselective they were in picking owners , it's comparable to an f355 or 360 from two decades ago which have all depreciated dramatically, irregardless of mileage or specs. There were thousands of these things made, and any Tom, dikk, and Harry could get one with the right banking job or celeb gig.
The long term value in your rari is how many other people have it also. In my earlier post I mentioned the Enzo or FXXX which are comparable to a modern SP3, of which only 600 exist. And they screen you heavily to get a buy offer.
And note that the SP3 costs 4 times as much as an f8, before the secondary market where it costs even more.
Just like their precursors the Enzo or FXXX , those SP3 will more than double in value by 2043 when that kid is grown.