I really wonder, why MC only has one child until now.
I mean, he had banged a dozen of girls from various races, but only managed to knock-up the main girl?
That seems really odd.
Also, the child doesn't really look like a child at all.
I mean, yeah he is a Demon, a different race.
But physically Demon race aren't that different from Humans, except the horn and being only slightly taller. So, its really odd for a 5 month old baby to look that big, especially in that diaper scene.