Transcript for Actress Kristin Cavallari Ignites Vaccine, Autism Firestorm
former "Hills" star Kristin cavallari saying she's not vak sin eight in her children because she believes it could cause autism. It's reignited a debate. Linzie janua Linzie Janis has the story. Reporter: Kristin cavallari is no stranger to criticism. Like a disease you can't get rid of. Reporter: But now, the wife of jay cutler and mother of 1-year-old cam den, with another baby on the way, is under fire. Are you opposed to vaccinvaccines. Oh, we didn't vaccinate. There's a pediatric group that hasn't vaccinated one of their children and they have never had awe stichl. Reporter: One person tweeted go to medical school and get educated if you feel the need to publicly speak out of these issues. Cavallari telling ABC news overnight, I'm not trying to start a controversy or be an advocate. Just a mommy who believes every parent has the right to make their own decision. But this pediatrician says it's a dangerous choice. We're experiencing an epidemic of measles and whooping cough driven people that would rather believe a celebrity than their pediatrician. Reporter: For now, as cavallari asserts, parents have a choice. For "Good morning America," Linzie Janis, ABC news, new York. Joining us now is our seron medic senior medical contributor, Jennifer Ashton. We taught thought this was settled. But Colorado just passed a bipartisan measure. It's natural to be concerned for our kids. A universal parental emotion. According to the journal pediatrics, tournament scientific document does not show a link between the mmr vaccine or any combination of vak Keens in autism spectrum disorders. There are still some parents. How do you allay those fears? I think parents have to answer four questions. What are the perceived risks or the real risks of the vaccine? What are the benefits? What are the risks of not vaccinating which are significant recently in measles and whooping cough outbreaks and what are the benefits of not getting the vaccines? Talk to your child's pediatrician. I think that's why Colorado put this law in place. Because of the outbreaks. My role, as a mother and a doctor, inform my decisions. I have vaccinated my children. I encourage my patients to do the same thing. I'm telling you. The debate rages on, still. You have the evidence here. There has been very firm and medical. And it's not -- It's not. We always want parents to have the right to make their own decisions. Medically and scientifically, it's clear. Talk to your doctor. 100%. "Dancing with the stars" is
This transcript has been automatically generated and may not be 100% accurate.