Cats with pregnancy symptoms will vomit before giving birth. Furthermore, female cats vomiting before giving birth may also be caused by eating a large amount of food before giving birth. Before giving birth, the food in the stomach is vomited before it is digested due to painful contractions. This is normal. Keepers need not worry. Female cats should not have strangers around them when giving birth. The surrounding environment should be kept quiet to reduce distractions so that the female cat can concentrate on giving birth.