We sexed ours after two weeks of life. Had nineteen babies & knew we couldn't keep them all. Look at their little heads. At this age, the males' heads are more "jowly," that is, they aren't tapered at the back like the female's. We kept two, at the time hoping that we had a male and a female based on this observation. They were the runts of the litter, and there was no aggression on their part. We were right in our sexing, and these two became "Laurel" and "Hardy."

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