Women who are obesed have been studied to have an increased chance of conceiving twins and multiple pregnancy. In a study reported on Webmd shows that there's correlation between increased BMI and multiple birth.
An American study found women with a pre-pregnancy BMI of 30 or more are significantly more likely to have twins formed from separate eggs and sperm than thinner mothers.
Researchers found the proportion of US women ages 20-39 with a BMI of 30 or more increased from 9.3 per cent in the early 1960s to 29.1 per cent in 1999-2002.
They expect the rate of twin births to increase as the percentage of obese women continues to rise.
How much a woman weighs when she gets pregnant and how much weight she gains during pregnancy can affect her health and that of her baby. The developing fetuses of obese women also are at increased risk for health problems. For example, researchers found a connection between maternal obesity and neural tube defects, in which the brain or spinal column does not form properly in early development. Also, research suggests that obesity increases a woman's chance of giving birth to a child with a heart defect by around 15%.
The video below shows the multiple birth
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