Narrator: This is Science Today. A new analysis found that babies who are breastfed for even a short amount of time have a lower risk of developing childhood leukemia. Marilyn Kwan, who led the University of California, Berkeley study, says while this is encouraging for mothers, it's not meant to alarm women who do not or can not breastfeed.
Kwan: This is an epidemiologic study and I think it certainly is helpful if you do breastfeed, but if you don't, it's not something you need to be worried about.
Narrator: Kwan says that's because even though childhood leukemia is the most common childhood cancer, it's still a very rare disease.
Kwan: Probably the rates are one in ten thousand. It's not very common and the risk is so low that with what we found here, it's encouraging for moms. It gives kind of a sense of reason for a mom of a childhood leukemia child – what might be some of the causes or what might prevent the disease, but the risk is so low, so there should be any alarm.
Narrator: For Science Today, I'm Larissa Branin.