Research has revealed that around 10,000 babies every year are at a higher risk of dying or suffering long-term health problems as a result of obesity during pregnancy.
Around half of all women of childbearing age in the UK are either overweight or obese, according to pregnancy charity Tommy's.
A survey conducted by Tommy's showed that almost half of women in the UK are confused about how much they should be eating during pregnancy. 40% believe they should eat an extra 500 calories a day when pregnant, instead of an extra 200 calories in the final 12 weeks, as recommended by Tommy's.
The survey also found that one in six women do not take folic acid supplements when trying to get pregnant, and more than half do not take vitamin D supplements at all during pregnancy.
The charity has now launched its five point pregnancy plan, to help advise mums-to-be on maintaining a healthy lifestyle during pregnancy. Read Tommys Five Point Pregnancy Plan