Pregnant women with higher levels of Vitamin-E in their blood are likely to give birth to bigger babies, says a study.

Theresa O. Scholl and colleagues at the University of Medicine and Dentistry of New Jersey in Stratford followed 1,231 women and measured the plasma concentrations of alpha-tocopherol-one, a form of Vitamin-E, at week one and week 28 of their pregnancy.

They found the women who had a higher level of the vitamin during the tests tended to have bigger children, reported news portal All Headline News.

It's possible that Vitamin-E directly affects birth size by increasing blood flow and nutrients to the foetus, the researchers report in the American Journal of Clinical Nutrition.

Although it's not clear that women should take any extra Vitamin-E beyond what's in standard prenatal multivitamins, scientists said a healthy diet is essential for the overall development of the foetus.