Fiction:Mumble Arigra Interstellar Empire/Government and Populace

Populace
The mumble Arigra Empire has a truly immense population, many many trillions in size, due to their Mothers not being capable of NOT having children. They are not permitted to alter themselves genetically, against their religion, and they refuse to kill their own young, so instead they make their slow sprawle. One planet at a time, they have spread to a total of 72,538 planets and turned them into cities. Literally, city planets, all obeying the Mothers. They do not spread to a new planet until they absolutly have to, but at any given moment they can have up to 50 planets being worked over into City Planets, due to the ever exploding population. One Mother can have thousands of babies in a single week-long period of time, which is always stressful to the infrastructure of the Empire. 1 in 3 ships are carrying babies and workers to a new planet, so attackers are killing the children first, which is not a clever thing to do to the Mumble Arigra Empire.