They are looking nice and healthy - are you feeding them anything special? Some wheatgerm sprinkled on the nest or grated vegetables such as carrot and/or cucumber would be gobbled up I am sure.
I had hoped to have a litter around now but the mother has reabsorbed the entire litter for a second time so early retirement for her. On a happier note though I found three baby Roborovski Dwarves tonight when cleaning out Pippin and Merry's tank - I had hoped to have this done before they were born but mum must have been further advanced in pregnancy than she looked. Dad was trying to get frisky already