British Shorthair cats usually give birth to 3-5 babies during pregnancy. If this is the first pregnancy for a British Shorthair cat, the number of babies will be relatively small, usually around 1-3. If the British Shorthair cat has had several pregnancies, the number of pregnancies will be relatively high, usually 3-6. Some cats are in better physical condition and may give birth to around 8 babies. ​​​​​​

If the owner wants to know how many fetuses there are in the British Shorthair cat, he can take him for a B-ultrasound examination around 30-45 days into pregnancy. Twenty days after the cat is pregnant, the nipple color gradually turns pink and the breasts begin to enlarge. About one month into the pregnancy, the abdominal circumference begins to increase.