I have roaches, can I break my lease?

I live in california and have a one year lease. There are still six months left before the lease expires. When I moved in I noticed there were roaches and the manager had a company come out and spray my apartment. The problem did not go away completely, but with the cold weather I started to notice fewer roaches. I did not want to have the apartment sprayed again due to the fact that I was pregnant. Now I have noticed several roaches in my home and my daughter is now one month old. I told the manager about the problem and also mentioned that I do not want any sprays in my apartment due to my daughter. The roaches come out of the walls and the entire building is full of them. The manager said she would look into what she can do, but I doubt she will be able to find a non harmful way to get rid of them completely. I also have mold in my bathroom. My lease doesn't state anything about roaches. There is a page however that says that apartment needs to be kept well ventilated to avoid mold growth, but I have kept it well ventilated. Can I get out of my lease? If so how?