breeding

[Robyn Savini]

I have two pied gerbils Gus and Gertrude.  They had a litter in September and 4 out of 5 made it.  Now they are grown up and all having babies but not one has made it yet.  I have Chocolate (female)  Tiny (female)  Skunk (male) and Diamond (male).  I've buried about 20 or so babies.  It's heartbreaking.  It seems like nobody is feeding them.  I don't know what to do to make the next litter live.  Any suggestions?