my cat Re:kittens

Question
My cat has given birth 3 times the 1st time she had 1 kitten the 2nd she had 5 and then the last time she had 4 I think this may be threatining her life is it? we also think she is pregnant again. The last time she could've started the birth process was DEC. 23.  

Answer
Having multiple litters certainly isn't healthy for her.  Litters should be limited to one a year, in general.  Even then, a pregnancy is hard on a cat's body.  Unless she is being bred for a good reason, she should be spayed for her own health and to prevent the homelessness of her kittens and others.  She can be spayed once she has weaned her last litter and her milk has dried up, about 10-21 days after weaning.  You will need to keep her indoors and away from unneutered males until she is spayed to prevent another pregnancy.