Fertility treatments like in vitro fertilization led the twin birthrate to rise from the early '80s. Now the rate has started to decline among white women. JGI/Jamie Grill/Getty Images hide caption
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The temperature in a cryogenic tank at a fertility clinic in suburban Cleveland fluctuated earlier this month, rendering some 4,000 eggs and embryos nonviable. Lluis Gene/AFP/Getty Images hide caption
Fraternal twins come from two separate eggs, unlike identical twins. Owen Franken/Corbis Documentary/Getty Images hide caption
The Keils play with their twins, Matthew and Faith, at their home near Parker, Colo., in 2012. Ed Andrieski/AP hide caption
Insurance coverage for egg freezing and other infertility treatments is not yet common. Science Photo Library/Corbis hide caption
Dr. Mats Brannstrom and his team perform a womb transplant operation in April. Brannstrom says they delivered a healthy baby boy to a uterine transplant recipient last month, a first in medical science. Johan Wingborg/AP hide caption
Getting to this point can be very expensive if in vitro fertilization is involved. iStockphoto hide caption
Nurses tend newborns at Sloane Hospital for Women in New York City. Pat Carroll/Getty hide caption