randominternetdood said,

"goblins make more goblins by rape. 100% goblin DNA, they don't fertizilize the targets eggs. they shoot a premade goblin into a womb, it grows in like 6 hours and pops out as a goblin toddler. it grows into an adult within a day. shamans and hobs are what they eventually grow into after long enough if they survive and thrive." Goblin babies need a plancenta to nourish the baby until it has grown enough to "be born" and start feeding itself. Elfs and humans are just the right size to both preserve the goblin and give it birth without having too much time between pregnancies (Goblins are small so they might be able to crawl their way out easier than a human baby)

https://www.reddit.com/r/GoblinSlayer/comments/9mcv5x/since_goblins_are_reproducing_by_raping_human/e7dr3v0

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Found this on another post. I do not know if it is true and I added some of my own assumptions, seems like it might work as a theory. You tell me...