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Pregnant with twins - NHS
Back to Finding out you're pregnant. Fertility treatments and the fact pregnancies are happening later in life has made multiple births more common. Identical twins are always the same sex, so if your twins are identical, you'll have 2 girls or 2 boys. Non-identical dizygotic twins happen when 2 separate eggs are fertilised and then implant into the womb uterus. It's usually possible to find out if you're having twins through week scan.
Ultrasounds have a variety of purposes during pregnancy, but the use that often receives the most attention is its ability to reveal the sex of the baby. Some parents-to-be can't wait to find out whether they're having a boy or a girl, while others choose to put off knowing the sex until birth. Either way, a sonogram — the grainy, black-and-white image that results from an ultrasound scan — will be baby's earliest picture and a couple's first chance to see the developing fetus.
A Newcastle University study involving thousands of families is helping prospective parents work out whether they are likely to have sons or daughters. The work by Corry Gellatly, a research scientist at the university, has shown that men inherit a tendency to have more sons or more daughters from their parents. This means that a man with many brothers is more likely to have sons, while a man with many sisters is more likely to have daughters. The research involved a study of family trees containing information on , people from North America and Europe going back to