What if you could control the personality, look, etcetera of your baby in pretty simple/achievable ways?
For example, it’s well-known that conceiving a baby in specific places (lighthouse, farm, top of a mountain, etcetera) leads to certain results. And that eating certain foods while pregnant, or (not) doing certain exercise, or saying certain words, all influence your baby too.
This might seem like a silly idea, but it actually has far-reaching consequences for conflict/story.
For example, what about parents who actively do these bad things anyway because they don’t care? Is that not a crime against their baby? And what about parents who “design” their perfect baby this way, but that baby grows up and wants to do something else and isn’t happy with this weight of expectations?