oh geez the old 'my kid/s could grow up to do (a) (b) (c). More likely your kids will grow up and be consumers just like you and I are, and the more kids you have, the more kids they will have and so on, and so forth.
Only children are not miserable without siblings, quite the opposite actually. We get more/better food because there is more money to go around, we are more intelligent because our parent/s have more time to spend with one, instead of more and blah blah blah. There is scientific evidence of this BTW, not just my own opinion.

Given the HORRENDOUS overpopulation of humans problem on this planet, which is only getting worse daily, I think wanting kids merely because 'I like babies' is, well, completely *wrong* I mean geez what do 99% of PT people advocate for dog/cat overpopulation? SPAY/NEUTER. Sure puppies and kittens are cute, but there are toooooo many unwanted dogs and cats in way too many kill shelters.

Why not pour everything you are into your already existing child, instead of having more? MAYBE then he can grow up to be a scientist or doctor or politician (eeww I hope not hehe).