In this episode, Kif is pregnant, because it is his species that gives birth, not the woman. But Amy does not know if she is ready to be a mother so she runs away. Kif gives birth in the end, and it is revealed that the babies will not be able to walk on land for a few years, and Amy promises she will be ready to be a mother when that time comes.
A good episode, some of it near the end was pretty gross, like when Kif gave birth, but overall a good, funny episode. Overall grade: A