@sexy I think OP is here and the gf is in Nepal, so don't worry about baby. And about 3/4 yrs if you are not talking about general, for visa current date for spouse is not that long.
If the gf gets visa then she will have her own green card upon arrival, so only problem is how to null the previous marraige.
I am not encouragin OP or anything but the suggetions does not make any sense, so just playing the devil's advocate. And thanks for talking to this kid. Cheers :)