Um....I'm just curious what you want to do with these hamsters....I feel like hamsters wouldn't be my first choice of feeder
As to sexing them, it's been YEARS since I had hamsters but I feel like it would be similar to mice/ rats. The female babies genitals will be closer to the anus. Adults are easy as the males have rather large erm.....cojones whereas females don't.
Here's a link I found:
http://www.hamsters-uk.org/index.php?option=com_content&task=view&id=68 from my PG86100 using Tapatalk 2