I am trying to imagine something practical to arm them with.
They would need some sort of RC weapon so that it could be fired without harming their mothers.
They would need video feed and perhaps other telemetry to acquire target.
There would have to be an interface device that had two way information and controll links between the fetus and the weapon.
Perhaps a neural link up.
Technology is inching towards these things becoming practical and useable , but babies are notoriously hard to train.