Something new is happening in perinatal health care. Many leading children's hospitals are creating fetal care centers as part of the continuum of care that they offer. We, and others, call this the paediatrics-based model of fetal-care. This is in contrast to the obstetrics-based model that offers traditional care to pregnant women and fetuses and has traditionally been the domain of obstetrics services.The pediatrics-based centers promise parents -and society -better outcomes, but evidence that the centers can fulfill these promises is still pending. Nonetheless, paediatrics-based fetal medicine is not being offered as an experimental protocol, but as a compelling new venture.Care in these centers will certainly be costly. Whether it will be efficacious remains to be seen. A number of features of paediatrics-based centers magnify ethical complexities. The location of fetal care centers in children's hospitals, rather than in general or women's hospitals, may carry different professional and ethical priorities into the domain of prenatal care. Traditionally, obstetrics has focused primarily on the health and well being of women, while pediatrics has focused on the well being of the child.Concerns for the well-being of pregnant women and fetuses overlap considerably. When the decision to continue the pregnancy has been made, the interests of mother and fetus are most often aligned. Divergences do occur, however, as in the case of severe preeclampsia, when perinatologists must weigh the risks to the fetus of early delivery with the risks of prolonged gestation for the pregnant woman, or again, when a potentially lethal or disabling condition is discovered in the fetus.