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Did supplements cause my cat's kittens to be too big at birth?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | unspayed | 0 lbs

Hello Dr. I have a cat who got pregnant at 7 months old. I gave her a calcium supplement and vitamins. Her kittens were born pretty healthy and some people said they were kind of big . The last kitten came out rear paws first and head at last and kitten suffocated; it seemed that kitten was the largest of all. The kitten got stuck in the vaginal canal and it suffocated. I guess my question is if the fact that I gave her supplements might have caused the kittens to be too large

1 Answer

Most Helpful Answer

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Answered By Claudia Fioravanti

Veterinarian

Published on March 12th, 2020

Hi, no the fact that Kittens were too big does not depend on supplements as these don’t cause an increase in size of kitten. Supplements don’t cause an increase in body size, they work within the body to help it get stronger. Excessive calories will cause an increase in size, however there is also a genetic component, if dad/dads were a big cat kittens might be too large to pass for a young cat that is giving birth for the first time. There are also other factors that will cause troubles giving birth, and the fact the kittten was positioned feet first was the main problem that caused him to unfortunately get stuck in the birth canal. This would have occurred with smaller kittens as well. Hope this helps !

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