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If baby A is born at 11:57 pm, theres a great chance baby B will be born the next day. He was enjoying his time to sprawl out.. Can a cow give birth to two calves days apart? - Ask Extension To form fraternal or dizygotic twins, two eggs (ova) are fertilised by two sperm and produce two genetically unique children. Women who have had a previous baby with birth defects or who carry a genetic disease themselves are at greater risk of having another child with a major medical problem. When Lilliya Konovalova became pregnant with twins, she didn't expect to give birth twice. Can one twin be born months before the other? When twins are born at different times, they are called discordant twins. Send questions to Cecil via cecil@straightdope.com. Mirror Image Twins. The exact cause of twinning is not known, but it is thought to be related to genetics, age, weight, fertility drugs, radiation therapy, alcohol consumption, smoking, stress, and other factors. When her daughter Liya was born, Konovalova was only 25 weeks into her pregnancy barely past the threshold at which a baby can survive outside of its mother. The chance of delivering two babies in a single birth is about 1 in 150. The phrase "Irish twins" describes two children born to the same mother within 12 months. Twins born on different days, months and years - but only 15 minutes apart Normally, a pregnant womans ovaries temporarily stop releasing eggs. Related: Blossoming Body: 8 Odd Changes That Happen During Pregnancy. Dr. Jon Dangerfield delivered little Olive and is quoted as saying Hes not coming. With a background in education and research, she is constantly learning more about parenting and raising multiples. I am working on my family tree and it appears that one of my ancestors delivered a child one month before having another, the earlier child dying and the latter child surviving. 22 Wonderful and Wacky Facts About Twins - Everyday Health After trying for several months, I realized I couldn't plan for everything. What is the best age gap between 1st and 2nd child? Carl and David Cowan are preemie twins born 39 days apart. An evidence-based approach to determining route of delivery for twin gestations. Answer (1 of 14): Yes. Rev Obstet Gynecol. The simplest model assumes that there are 365 days in a year, each sibling having the same probability of 1/365 of being born on any of those days, and their births are independent.