"However, an ultrasound at 14 weeks showed the twins ... He and his colleagues examined genetic data from 968 fraternal twins, as well as a number of large global studies, but found no other ...

Fraternal or dizygotic twins develop from two different eggs fertilized by separate sperm; they generally share about 50 percent of their genes. Therefore, fraternal twins are essentially like ...

Fraternal twins and multiples tend to run in families ... A multiple pregnancy is confirmed through a fetal ultrasound, an imaging test that uses sound waves to create pictures of your uterus and the ...

The girls are described as fraternal twins - with rare separate birthdays ... to be pregnant in only one uterus - until a routine ultrasound revealed there was also a baby in her second.