And when the number of babies reaches zero the savings become infinite

The lesson: don't let her get the idea you're a cost

That's the reductio ad absurdum of Kathleen Sebelius's argument before Congress that the contraception mandate will save the country money because “[t]he reduction in the number of pregnancies compensates for the cost of contraception.”   Thus, in Sebelius's view, and presumably the view of the Obama administration which she serves, pregnancy is purely a cost.