The new guidelines replace the obstetrician group’s earlier ones — which were exactly what led many hospitals to ban VBAC in the first place. But the group says it never intended to limit women’s access to vaginal birth, and it acknowledges that its policies may have helped fuel the trend toward too many Caesareans.

“It will be better for women in the long run if we can lower the C-section rate,” said Dr. Richard N. Waldman, president of the obstetricians’ group and chairman of obstetrics at St Joseph’s Hospital in Syracuse. The guidelines are being published on Thursday in the August issue of Obstetrics & Gynecology.

About 1.4 million women had Caesareans — or about 32 percent of all births — in 2007, the latest year with figures available, according to the National Center for Health Statistics. Like earlier guidelines, the new ones say that vaginal birth is safe for most women who have had a Caesarean, provided that the cut in the uterus was low and horizontal, the way nearly all Caesareans are performed today. Sixty to 80 percent of women who have what doctors call “a trial of labor” — an attempt to deliver vaginally — after a Caesarean succeed.

The new guidelines go beyond the earlier ones, however, stating that vaginal birth after Caesarean is also reasonable for most women carrying twins and those who had two prior Caesareans.

Even if a hospital does not offer trials of labor after Caesarean, the group says, “such a policy cannot be used to force women to have cesarean delivery or to deny care to women in labor who decline to have a repeat cesarean delivery.”