Ooh! Look how big their ears are getting!
Sounds like they are doing well. I am sorry you lost those two- I have had a similar unfortunate occurance with a particularly rambunctious litter. The rest look like they are doing well, though.
Are they eating a lot of pellets, yet? When the I weaned the litter that I was hand-feeding a few months ago, they got the 'big belly, but skinny everywhere else' look until they really started chowing down on the pellets. Once they switched over to mainly pellets they put on weight quickly. Now, at near 4 months, they are so healthy and robust you wouldn't guess they were hand-fed!