My response would be very similar to Fleurs, with some additions. Dreaming of babies/children is very often about creative ventures, as our creativity springs from our sexual and maternal energies. That they are male speaks of "yang" ventures/projects - where you are bringing your gifts 'out there' into the world, in active, visible ways. Like Fleur says, their twinness is a significant symbol too - they arrive together and inherently similar whilst still being their own individuals.