That will help, but let's say if you have him within a couple years , he should be able to fit into them around 14-15 years old? So I doubt they will make it 18 years or so. However, you could do a sole swap down the line. My wife and I are having our first baby in February and I would love to do the same, I just don't think they will make it that long. Here's to hoping though.
Man don't worry fam , Jordan brand ain't stupid they will retro the supreme many times by the time your boy old enough to rocl large sizes.