Another thing we can do as a practice is make it normal to name kids before they are born. It will be harder on mothers who have still births. But mothers who take still births hard take still births hard because it is reasonable. You lost a child. That's a big deal. It's time to stop dehumanizing fetuses. On one day there is a child that you can see because it is inside of someone. The next day you have a child you can see because it is not. It being visible doesn't change that much about its own nature or the morality of harming it. "I haven't seen it with my own eyes therefore I can kill it." Insane. Ethically bankrupt. Also you could give tax deductions according to the number of kids you have (we already do that), and count an unborn child as a dependent. One more idea is for your personal age, in common circumstances, we should keep doing it the way we have. But for medical purposes age should be measured since conception. This is actually better for premies so there is a medical basis. The reason why we shouldn't make that common outside of medical is no one wants to identify their age by the night their parents did it, or celebrate it every year, or tell other people what date that was. So birthdays still mean birthdays. Birth age will take the place of how we use age to day. Age aka full age aka medical age is measured by conception.