Compared to infanticide? I think it's fairly obvious who's not being serious here.
No, compared to breastfeeding.
You can't even parse your own analogy properly, how sad. No wonder they no longer include analogies on the SAT; kids today never learn how to handle them. Here, let me help you.
Here is the analogy you are making,
carrying to term : abortion :: breastfeeding : infanticide
You're comparing abortion to infanticide and carrying to term with breastfeeding.
Of course, your analogy ignores the fact that with our current capabilities, the only way to not carry a fetus to term is by abortion, whereas there are many alternative results to not breastfeeding a child other than infanticide and the use of formula.