I think medically, this is such a rare thing, that I think we don t have a better way of describing it besides still calling them twins, Dr Shweta Patel, who specializes in obstetrics and gynaecology, said.
A woman becomes pregnant while already pregnant: In an unexpected rare case, a woman from USA became pregnant while she was already pregnant. The woman gave birth to twins within a span of six minutes. She suffered three miscarriages after which the first child was born.
Woman Conceives a Second Child while Already Pregnant in a Rare Double Pregnancy in UK
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In an extremely rare phenomenon called Superfetation, a woman experienced a double pregnancy where she got pregnant for the second time with her daughter while already being pregnant with her son.
39-year-old Rebecca Roberts conceived her twins daughter, Rosalie and son, Noah three weeks apart. Their visibly different sizes make it hard to believe that both are twins, which make them a medical wonder. The phenomenon of Superfetation is incredibly rare as there are only about a dozen such cases that have been documented across the globe.