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My young female rat isn't in heat, but her sisters are. Is it normal?

Updated On September 23rd, 2025

Pet's info: Small Animal | Rat | Female | unspayed | 2 months and 29 days old | 0 lbs

My 13 week old rat has never gone into heat and all her litter mates have already.

1 Answer

Most Helpful Answer

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Answered By Todd Cecil

Veterinarian

Published on October 13th, 2019

Thanks for reaching out about Oakley. Some are slower to mature than others, but also the possibility of a light cycle that was just missed. If acting well, alert, eating/drinking normally, continue to monitor. Good luck.

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