A few months later, the rhythm method failed and my mom learned the first of her three lessons.

She also hopes to promote natural birth control methods, like the rhythm method.

Even with all these precautions, women have often gotten pregnant using the rhythm method.

The rhythm method, it was explained, differs among Latin countries.

The rhythm method is not suitable or protective during nursing.

These failure rates would be higher than those of almost all other birth control methods, including the rhythm method and withdrawal.

But it also happens often in women who are not, and in those using the "rhythm" method.

Currently, many fertility awareness teachers consider the rhythm method to have been obsolete for at least 20 years.

When used to avoid pregnancy, the rhythm method has a perfect-use failure rate of up to 9% per year.

These periods and intervals are important factors for couples using the rhythm method of contraception.