That's cool for most cases. Without getting into the problems that come along with Adoption and the adoption system, I'd like to focus on just two problems:Too bad. You have to go through 9 months of pregnancy for a baby you are going to put up for adoption.
1. Health of the Mother - Pregnancy is not easy. There are a lot of problems that can come with Pregnancy, and, in many of those, it's the health of the mother that's an issue. To force people not to abort means that, in some cases, you're choosing the life of the child vs the life of the mother. You can know about many of these problems as early on as the three months mark, and sometimes the same woman can't give birth to another baby after having already given birth to others previously. When the health of the mother is in jeopardy, do you still maintain that they should just go over the 9 months and then put the baby up for adoption?
2. Health of the Baby - That might not even be an option, the mother could not have health enough to carry the baby for 9 months, and, if it's too early, the baby itself might even die anyway, so you waste 2 lives. And there are tons of diseases that are hereditary that do not allow for healthy babies to form, and if someone does get a baby, you're condemning that baby to die in uterus or just a few seconds after being born, and that's very risky for the mother, when you could have killed it before it had any sort of sentience. And I'm not even speaking about sub-par lives, where the baby is born severely deformed but could live for some years, I'm speaking about actual death, but death at a point where the baby can suffer already.