"The data forced me to change my opinion. We now know that twins are not twice the risk of singletons, they are more like four times the risk. For instance, there is a 1 in 700 chance of cerebral palsy with a single birth, but 1 in 100 with twins. If you define success of a pregnancy as a healthy baby and a healthy mother, it's safer to reduce to singleton. Women should be aware that this is a possibility," he says.
Psychological Fallout of Reducing
Though Evans argues that reducing twins is medically justifiable, this procedure remains highly contentious, especially considering that some couples admittedly choose to undergo reductions for personal, not medical reasons.
"It's easier to justify going from eight fetuses to three, because you could have lost the whole pregnancy, but it's harder to think about reducing twins, because most twins are born perfectly healthy," Ross says.
Though the idea of reducing the number of viable fetuses based on personal preference raises hackles among many, proponents argue that if women are allowed to abort pregnancies based on personal preference, they cannot be denied the right to abort only part of a pregnancy.
After her own experience with unexpected multiples, Dr. Ross's concern lies not in the moral questionability of twin reductions, but in the psychological welfare of the couples. Though she did not opt to reduce her triplets, she says she has seen the psychological toll that reduction can take on parents.
"At the time you make the decision to reduce, parents don't know what the future will hold. Some of the families go on to experience a lot of grief. At every milestone for the child they decided to keep, there is this ghost in the room, this feeling that there should have been two of them," she says.
Maureen Doolan Boyle, executive director of MOST, a national support group for families with triplets or more, says she sees a similar sense of loss and grief with some of the couples she counsels.
"It's not uncommon for couples to reduce, say quads to twins, and then when the twins are born healthy, they feel guilty, thinking, 'We did well with two, maybe we could have done well with four,'" she says. "There is this period of grieving that many go through."
Women who have had challenges getting pregnant are already at an increased risk for post-partum depression, she adds, so women undergoing reduction may be more likely to suffer psychologically after the remaining child is born. "My concern is that couples go in fully informed of all the possible outcomes or risks when choosing to reduce," Doolan Boyle says.
Though they are not opposed to selective reduction, Doolan Boyle and Ross argue that couples need to be better educated about the possibility that they may have multiples, so these "unexpected" twins or triplets can be prevented in the first place.
"Had I known I would have this many babies, I wouldn't have transferred as many embryos. Many parents of multiples say they wish there had been more discussion of the chances for multiples with in vitro fertilization," says Ross.
"We need to educate couples so that they know that if they are only willing to have one baby, they should only be transferring one embryo at a time," she says.