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

Identical, or monozygotic, twins develop from the same fertilized egg that splits into two. These twins are the same sex and share the same genes. Sometimes called paternal twins, identical twins ...

The ultrasound study revealed that twins have less fat tissue and less muscle mass than singletons beginning at 15 weeks of pregnancy. If results are confirmed by additional research, the findings ...

Britney and Frankie Alba welcomed identical twin daughters Lynlee and Lydia in ... they didn't think their ultrasound technician was being serious. "We start laughing because we think it's a ...

The ultrasound study revealed that twins have less fat tissue and less muscle mass than singletons beginning at 15 weeks of pregnancy. If results are confirmed by additional research, the findings ...