Pseudo-pregnancy in Female Cats
 
A hormonal imbalance is thought to play a central role in the development of a false pregnancy, or pseudopregnancy, in which a non-pregnant female cat shows such symptoms as lactation or nursing without producing kittens. The affected female cat shows these symptoms about a month or two after her estrus (heat) is over. Depending on the severity of problem, the symptoms may last for more than a month. 
 
Symptoms and Types
 

Behavioral changes
Non-pregnant female cat may show symptoms of mothering activity, ...read more