[Crystalroborovski]

I can't exactly tell from the pictures what gender they are. Someone else may be able to help you with that, or you can put the hamsters, one at a time, in a glass bottomed container and snap a few pictures of their underside so we could get a better look.

I'd like to point out something- you said you got your hamsters back in January of last year, so they are over 1.5 years old, correct? I'm not an expert on breeding however the female is a bit old to be breeding. If I remember correctly dwarf females shouldn't be bred after they are 1 1/2 years of age. Again, I'm not an expert on this topic so a professional breeder will probably be able to help you out.