How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Cher Your Own Question
Cher, Pet Caregiver 40+yrs
Category: Pet
Satisfied Customers: 20863
Experience:  Specialist in Pet Healthcare and Behavior
Type Your Pet Question Here...
Cher is online now
A new question is answered every 9 seconds

how do i tell my baby guinea pigs sex. We bought female for

Resolved Question:

how do i tell my baby guinea pigs sex. We bought female for petco and it had babys help.they are 4 weeks old.
Submitted: 6 years ago.
Category: Pet
Expert:  Cher replied 6 years ago.
Hello,Customer and thanks for your question.

Congratulations on your new cavy family!

I'm so glad you're asking this question now, because male guinea pigs (boars) should not be housed in the same cage with their sisters or mother (sows) after the age of 3-4 weeks, in order to prevent pregnancies, so you need to separate them as soon as you determine their sex.

Females usually have a smooth swelling over their genital area. It can sometimes look bumpy causing you to mistake it for a male, however, if you gently part the genital opening on a female, you should see a "Y" shaped opening, and then you'll know it's definitely a female (sow).

To check if some of your babies are males (boars), press gently just above the genital area. If it's a male, you should be able to make the penis slowly come out, due to your gentle pressing. However, don't be fooled if you don't see a penis present; sometimes the penis can be tucked away and out of sight, in folds of skin (usually in older males, so with the babies, it should be easier), making it look completely like a female. You should try to get the penis to ease out, just to be sure you have a male. In addition, younger males will have a donut-like shape around their anus, where their testicles are located.

If you're still not sure of their genders, bring your guinea pigs to a vet who is experienced in treating them; don't bring them to Petco or another pet store, as the clerks may not give you the correct information you need. Only a vet who's used to working with guinea pigs will be able to provide the most accurate information on which ones are female and which ones are male.

You can see photos and a detailed description of how to determine the gender of your baby piggies, below, in addition to much more helpful information:

If you have found this answer helpful, please click 'Accept' and leave positive feedback; if you need additional information, please click 'Reply'. Thanks for the opportunity to be of help.

Best wishes to you and your guinea pig family!

Edited by Jessesmom on 2/13/2010 at 6:33 AM EST
Cher and 3 other Pet Specialists are ready to help you

Related Pet Questions