Anyone ever have trouble sexing 11 day olds?

[J2]

My last litter was so easy, I could tell I had 3 females and 2 boys at like 5 days old.

This litter... omg. I come up with a different number each day and I've been trying to sex them since 6 days old! They're 11 days old now.

1 of the Agoutis is obviously a female. The rest of them.. Some look like they have slight dots on their sides, but then I can't find the 2 dots on the chest...
Shouldn't a female have ALL the nipples showing? Then again, shouldn't a male NOT have any kind of mark whatsoever on his sides...

1 of the blacks has 6 pink dots, including the chest..so obviously a female...
The other black... Also seems to have a spot on his sides, but none on the chest...Although with that one I can't tell if the pink spots are kind of underneath his paw or something.. My first black pups so yeah I have no idea if that's normal or it's a girl. It doesn't look like the other one, but he has the spot on the side like the agoutis...

Is it normal for some females not to be so obvious?

Maybe I just have half boys/half girls.

[Ritzie/Admin]

I usually watch for nipples when they have an age of about 10-12 days! Than the hairs on their belly start to grow and are the nipple very visible. however some have told me the following:

I wouldn't go completely on that. I've had litters of gerbils in which males have also developed a few nipples. Look for differences in genitalia also just to be on the safe side!

Here you can see a female duprasi gerbil (fat-tailed gerbil) of about 2 weeks old. The nipples are clearly visible on the bottom, and no on the chest! (I don't have a picture of a Mongolian gerbil with nipples!)

[queenofthenile]

Yeah, if in doubt, look at the genitals. Here's a link to my picture of 11 day olds with both the nipples and genitals...
gerbilforum.proboards21.com/index.cgi?board=breeding&action=display&thread=1081611055

[j]

I tried going by the genitals.

Now I came up with 5 boys and 2 girls. And probably only 2 girls cause they have ALL the obvious nipples. lol. And the 'males' seem to have a darker spot down there. The girls didn't.

I give up. Too late to really tell by the other nipples cause the hairs are starting to cover it. But yeah only 2 really show.