baby mice...?

Question

i have a litter of baby mice and i dont know how to tell what gender they are, they are about three weeks old and they just opened their eyes and are running around like crazy.


serious replys only please

Answer 1

I have owned multiple rats and mice. You will most likely not be able to tell the gender for another week or so. It will take a while till the mice mature enough for you to be able to tell for certain.

As soon as you CAN tell, though, SEPERATE THE FEMALES FROM THE MALES!

Mice can have babies only a few weeks into their lives! You will end up with MULTIPLE litters if you don't seperate them.

A vet who specializes with small animals might be able to tell sooner, though two weeks is much too young for anyone to be able to tell. Check with your local vet if possible.

Contact me if you need more help.

Hope this helps! Good luck!

Answer 2

It's really hard to tell when they are young..
but it must be done since they need to be seperated by 4-1/2 weeks so they don't accidentally mate.

I have rats and I hate having litters simply because I have to sex them *lol*.
The short and long of it is the females genitals are closer to the anus then the males.
Also you will see the tiny teets on the female (hard to see depending on the color of skin and fur)

here is a good site. It has pictures too!!!! =D
and it also has a picture of the nipples too which is very helpful.
http://www.thefunmouse.com/info/sexing.cfm

My advice is to look at a few of them, I thought I was totally sucking my first litter because I had 8 babies. Started sexing them and by the fith male I figured I was totally wrong... nope.. I ended up with only 2 girls in the whole litter. *lol*

It's a lot easier to compare them to eachother, then try and compare them to a picture on the web.
Don't sweat it if it ends up you made a mistake, just put them in the right tank. by 4-5 weeks the testicles will start to decend so it's easier to tell... keep in mind though that some males are slower to develop, so don't think you are wrong if all but one "male" looks to have teste's except one. just compare that one to the distance on another male and to another female to see if you still think he's male.

Good luck =)

Answer 3

When I was in H.S I was supposed to train two white baby mice through a maze for a biology class. The 2 mice where both female and pregnant and before the project was due they had 2 litters and then the litters started having litters. Bring them to a school or pet store, don't do what I did. I brought them all to school early in the morning (unusual for me) and let all 72 of them loose all over the school. All day you could hear girls screaming.

Answer 4

male mice over 6-8 weeks of age the testicles are usually readily visible. One way to tell the sex of a mouse is, under their tails, the distance between the anal opening and genital opening is shorter in the females. It may be hard to tell the sex in young mice

Answer 5

This may sound funny but .... hold them up by the tail and look at their "parts" there is a difference in spacing between the " dots and dashes" the ones with the farther spacing are male. Eventually the males will grow the "hangy downs".

Answer 6

Look at their rear ends
since they are about 3 weeks you should have no problem seeing if their "Parts" are close together {Girl} or slightly farther apart {male}
As they get older you'll have no problem finding the males as their testes will drop in a week or so

Answer 7

baby girls have nipples baby boys dont. also theyre pee holes and poo holes are closer together on girls and further apart on boys. you dont need to separate them till like 5 weeks, after the mum has weaned them off her.

Answer 8

Hope this helps