Kitties not thriving

Sadly, this morning I had to lay two of the newborns to rest. So now we are down to four and one of those is not moving as much as the rest nor eating as much. The good news is the other three are quite active, aggressive about eating and very mobile (for 6 day old kittens with their eyes still shut). It's sad, though, I was hoping we'd have a big batch this time.