https://lonarpg.fandom.com/wiki/Cross_Breeding_and_Rebirth
If Moot (long ears) baby then you need to do nothing.
If Deepone (body odor fish person) then you have to go to fishtopia caves and find the deepone mother and talk to her
If abomination (red eyes and sickly) then you have to speak to the fortune teller.
Abomination baby is the best, but the hardest to get. Lona has to give birth to 2 abomination babies and sell them to Elise (Sell option NOT barter) for it to become an option.