| Singular | Plural | |
|---|---|---|
| Nominativ | postgenitus, postgenitus | postgeniti, postgeniti |
| Genitiv | postgeniti, postgeniti | postgenitorum, postgenitorum, postgenitum, postgenitum |
| Dativ | postgenito, postgenito | postgenitis, postgenitis |
| Akkusativ | postgenitom, postgenitom, postgenitum, postgenitum | postgenitos, postgenitos |
| Ablativ | postgenito, postgenito | postgenitis, postgenitis |
| Vokativ | postgenite, postgenite | postgeniti, postgeniti |