A study from the NIH reveals that twins have smaller thigh volumes, less fat, and less muscle mass than singletons starting ...

The National Institutes of Health April 7 released a study that found twins — smaller at birth on average than singletons — ...

Twins—smaller at birth, on average, than singletons—start out smaller in pregnancy than was previously known, according to a ...

Twins—smaller at birth, on average, than singletons—start out smaller in pregnancy than was previously known, according to a study by researchers at the (NIH).