I have been brewing for about a year now and have been trying to learn a lot as fast as possible. That being said I would be surprised if one of the experts in home brewing could pull off what you are trying to do, and have it taste good that is (I probably would not be that suprised). I have a 7 month old son myself and the idea is super cool. For the novelty of the idea you could make something and then give it to him on his BDay 21 years later and it would still be a cool idea, but I doubt the beer would taste all that good.
If you try go for a very high ABV, cork it, put it in a temperature controlled area on its side and don’t move it. Good luck.