European Black Bear Hamster Sexing

Question
Hi,ive been trying to sex my hamsters.Ive looked at a lot of sites,but it is still extremely hard to tell the difference.I can tell that a couple are boys but i cant really tell the difference.i have nine pups and i think that three are females and six are males,but thats just how they ended up because i kept checking them and changing my mind and i rely need to find out what i can do.Thanks

Answer
I have a website with some pictures, the black bear will be similar to the syrian. At that age it might be hard to tell.

http://www.hamsterific.com/HamsterUniversity/SexingHamsters.html

In addition, some other things to look for:

-Males have elongated backs, where as females will appear shorter.
-The males "butts" will be very large an puffy, though this is really the testicles, and this will appear by 4 weeks.
-The anal and vaginal openings will be close together in a female, and in a male the anal and penile areas will be farther apart.
-The females will have nipples, even if you have to part the hair on their tummy to see.

Hope I've helped