i don't know if you are telling the truth here (maybe you took a photo of someone else's baby) but i congratulate you on the smooth delivery process you are experiencing. i fully support what you are doing, the price of bitcoin is currently under $30k, so it is a good moment to buy, definitely in the next 18 years, the price of bitcoin will increase and your current $50 investment will double (your child will definitely be very grateful to you)
Of course, if he can keep the investment for so many years, he can earn 5x, 10x instead of double. But I think he should gradually increase the money invested there. Because he is investing in his child's future and I think his child will thank him when he learns and understands about Bitcoin.For that if he gradually increases his modest amount here then surely he can take a huge amount of profit from here which will have a good impact on his child's future.