Are any of the females off contraception? Or are they happy with the infants they have for now?
I don’t know for sure but you can probably rule out Sacha, Lisa and Shiba who probably won’t breed again. It seems they are attempting to increase the age gaps between each female’s births (similar to what they did with their elephants). Ceres was placed on contraception recently (during the Who’s who at the Zoo series, I believe), and there was an article from last year that mentioned Kuma had been placed on the pill again as well. So unless you consider Sembe (who they probably won’t breed from until another few years), I don’t think there will be any infants in the near future.