By contrast, most of the attention that the medical literature dedicates to twins is warranted and helpful. Gestation and birth are more complex and risky for twin babies and their mothers than for singletons. The health consequences of premature birth—nearly 60 percent of twins are born premature—are valid issues to address, especially as new reproductive technologies are resulting in higher twinning rates. However, biologically healthy twins receive short shrift in the medical literature.