mosaic embryos have potential. n't have the same potential as a chrome domally normal embryo. >> reporter: he says mosaic embryos carry a higher risk of miscarriage. >> we have to learn which ones are more likely to make the baby and which ones are less likely. then patients get to decide whether to use that embryo. >> reporter: according to one study, mosaic embryos create a baby roughly one-third of the time. out of 78 transferred mosaic embryos, the study found 24 healthy babies were born. but some doctors like mandy katz jaffe, scientific director at the colorado center for uctive ainst implanting mosaic embryos, pointing to a lack of long-term studies of babies born from them. >> we really don't know the answer to the full question of what is the probability that a mosaic embryo will result in eith either a healthy baby. >> reporter: for the dunns, they believe they are living proof of its value. >> if one person sees this interview and decides, you know what, i have a mosaic embryo that i was questioning wheth

the twins grew from mosaic embryos. . abnormal cremes can self-correct. the challenge is knowing the extent of abnormality and what that means for pregnancy. >> how did they explain what mosaic mean? >> miscarry. >> that's with every pregnancy. >> right. >> the decision to transfer these is spurring debate among fertility experts. dr. dremy lingo -- >> mosaic embryos are not normal embryos. mosaic has the same potential. they can make babies. >> though he says mosaic embryos carry a higher risk of miscarriage. >> we have to learn which ones are more likely to mack the baby and which ones are less likely. >> reporter: according to one study, mosaic embryos create a baby roughly one-third of the time. of the 78 transferred mosaic embryos, 24 were born healthy. there was caution against implanting mosaic embryos. >> we really don't know the answer to the full question of what is the probability that a mosaic embryo will result in a dissected baby or healthy baby. >> for the dunn. they're living proof. >> if one person sees th

. >>> plus advances in in vitro fertilization are spurring debate over embryos called mosaics and whethernts should have them implanted. >>> and pushing the limits, a bike race across the country like no other. that's the "cbs morning news" for this wednesday. thanks for watching. i'm anne-marie green. have a great day. -- captions by vitac -- www.vitac.com july 25. i'm kenny choi. and i'm michelle griego. time is 4-- >>> good morning, it's the end of july and fog 25th. thanks for waking up with us. i'm kenny choi. >> i'm michelle griego. yeah, "karl the fog" is here! it's still lingering around. it's a good sign. >> it won't get as hot here as across the rest of the city. >> i guess that's good. >> we have that. it's promising for the bay area. you can see the clouds rolling in. there will be low clouds and fog this morning. light drizzle. we have the ridge of high pressure to the south of us. that's pushing in the west wind. the coast will be staying cool. 60s and 70s for afternoon