My arguments on organ transplant have to do with altruism . If a woman decides to continue a pregnancy , especially if it involves serious health risks, that is altruistic of her just as it is altruistic if someone gives another person a kidney or a bone marrow transplant.One should not be required to carry a fetus or give someone else a kidney or bone marrow, even if they die as a result . Killing a toddler because they are annoying or a financial burden is not analogous because you cant compare a financial burden to a situation in which one is deprived of the right to their own body.
If a person needs an organ transplant in order to survive , we don't force another person even a parent to save them,because altruism is optional ,but many people would like to force women into the altruism involved in continuing an unwanted pregnancy against her will.