New Fertility Treatment Legalizes '3-Parent Babies'

British Parliament approved the new IVF treatment to create "three-parent babies."
1:58 | 02/04/15

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Transcript for New Fertility Treatment Legalizes '3-Parent Babies'
Groundbreaking but divisive fertility treatment has been approved by the british parliament for the first time. It'll be legal to create three-parent babies. ABC's Dr. Jen Ashton to explain what that means. Yeah, it sounds like something from a sci-fi movie, you guys but actually the terminology is not that accurate because 99.999% of the DNA comes from the man and the woman, the original parents. This is all ivf. All done via ivf. It's just mixed with the mig mitochondrial DNA of another woman. It was a small study, specific couples and explain why they were the ones. Right, I mean this is really going to affect about 4,000 babies in the U.S. Every year who would be born with this defect that could affect the brain, the liver, the muscles, so it's not that common in Britain it's even less common. But opponents say this is -- we're getting closer to sort of designer babies where you can choose eye color or hair color. Do you agree with that? You know, that's the question is will it be a slippery slope and the issue here is there are moral, ethical, medical, even religious issues but to think back historically, you know, the first transplant that was done, the first ivf baby that was done, it's very natural to have uncertainty and fear when something is this new and you always have to ask the question, what will be the long-term consequences? What do you gain for what you lose and vice versa and we don't know that because -- How do you draw the line? Here you do it to treat a disease to prevent a disease. How do you say, okay, that's okay but it's not okay to mess with the DNA because I want blue eyes. Exactly and to be clear this is not a way to make a baby with blue eyes versus brown eyes but where the political and legal will have to inter-ferb with the in he had Cal. It's going to be something we have to follow. It's good that people are asking questions. Absolutely. Ask questions. And you'll be available on morning long on Twitter. I get to move.

This transcript has been automatically generated and may not be 100% accurate.

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