Anyone have any success experience to share in hand feeding few days old baby hamsters?

This morning I found out that a stray rat came inside my house, attacked all my hamsters (Robo & WW) in aquariums.  20 hamsters  dead bitten by the rat.  Now left the babies without their mothers. Left only 3 male adult  hamsters survived from that attack.  Poor thing...now I use syringe to hand feed them.  Not sure they could survive or not. 

Want to ask u guys who own WW. My female WW gave birth 2 days ago, today i notice she look weak and tired like that.
Before today was normal very active, now look weak. Kinda worry

I put them together for about 7 day oredi..du hav any fight. A saw them mate on the 1st day..the at the 7th day. Is that mean the 1 mating is not succed?Should i put the male there untill the female's perut buncit?