Kif explains to the crew that his race reproduces through touch, their skin being a semi-permeable membrane which can absorb genetic material.
At the beginning of the episode, when Professor Farnsworth retreats to the angry dome, there was a debate amongst the writers about whether the viewers should be able to hear him or not.
They envisioned the angry dome as being similar to the Cone of Silence from Get Smart, but ultimately it was decided that hearing the professor was funnier.
However, on the DVD commentary, it is revealed that it was originally going to be explained that the room was much too small to have everybody fit inside, and that Bender was in the closet out of necessity.
The material that was eventually cut focused on the journey and a series of tasks Kif needed to complete before giving birth.
Club gave the episode a B+, saying: "At the very least, it makes an effort to deal with Kif and Amy in a way that’s unexpected, surprisingly heartwarming, and more than a little disgusting.
But it’s hampered by a structural choice which, while allowing for a big surprise in the final act, takes focus away from [Amy,] the one character who has anything resembling an arc in the story.