An embryo is clearly not an infant. But neither is a 12-week fetus. The question is where to draw the line. What if personalized regenerative liver cells could only be obtained from fetuses derived from cloning? Then therapy requires the destruction of a fetus and not an embryo. Such a scenario gruesomely stretches the definition of donation.
See, but we're not talking about destroying fetuses. Only you are. Cause you just brought it up. Right there. Yup. That's all you.