More and more women who give birth are overweight or obese, Green says. These women have a much higher rate of complications like diabetes and hypertension, which can lead to earlier births.. Of the roughly 4 million deliveries in the U.S. in 2002, 394,996 were considered preterm, according to the analysis.
'One-in-a-million' conjoined twins born to Atlanta parents: Delighted mom and dad welcome girls who share the same arms, legs and body-and will never be separated. 1  Asa and Eli Hamby born on Thursday morning in Northside Hospital, Atlanta.
Fraternal twins â the most common kind â occur when two separate eggs are fertilized by two different sperm. Each twin has his or her own placenta and amniotic sac. The twins can be two girls, two boys, or a boy and a girl. Genetically, they're no more alike than any other siblings. Identical twins occur when a single fertilized egg splits and develops into two fetuses. Identical twins might share a placenta, but each baby usually has a separate amniotic sac. Genetically, the two babies are identical. They'll be the same sex and share physical traits and characteristics.