It is literally being worked on and planned for the next update. It was mentioned in a post a few pages back, 3 days ago.
https://f95zone.to/threads/mad-island-v0-4-5-6-beta-e-made.209671/post-18636327
Though based on the Dev's comments on Cien it is probably just Man x Yona's child, since they said that they probably won't be able to create children variation for all the different monsters / characters with Yona in one shot since that would be too much work for them in 1 month.
View attachment 5448872
Pretty sure they will add it in eventually. You gotta remember that the only characters that could get pregnant for the longest time were the generic female natives, and the dlc female native. Only recently did they add pregnancy and children for more of the various generic female npcs.
Which should tell you that they are working on most of the generic NPCs first since it simpler and easier for them to do since they only have create like 1 set of art work / animations which will work for an infinite amount generic NPCs. So the return on time invested is much larger.
While the special named characters all have unique looks, body types, faces, etc... so having to make art work / animations for them, and their children has much less pay off for the amount to work that has to be put in at the moment.
It is most likely the stuff they will focus on last.
View attachment 5448931
