A woman in Houston last week gave birth to two sets of identical twin boys. The odds of that happening are about 1 in 70 million. The couple were not using any fertility drugs and already have a 2 year old son. When Tressa Montalvo was 10 weeks pregnant her doctor told her they were having twins. The next time Tressa came in the doctor said she was having two sets of twins. Two boys shared one placenta and the other two shared another. The husband says he wants a girl so they will be having more babies.