That's what happened to me with the last litter my rat had
(Mar 21,02). She had 9 babies total- one died, out of those 8, 7 were males and 1 was a female- that's my little Sweet Pea
My mom and I called them the "Band of Brothers"- you know, like the movie "Band of Brothers"- yea, anyhow.......

Here's a picture of the boys: