Experts say the discovery a 'gamechanger' and will now investigate if taking iron supplements could help prevent defects.
A study's found women who experience low iron levels during pregnancy are much more likely to have a baby with heart disease.
Researchers looked at data from 16-thousand mothers and linked anaemia in early pregnancy to increased chances of congenital heart disease.
Experts say the discovery a 'gamechanger' and will now investigate if taking iron supplements could help prevent defects.

TikTok Agrees To Appear Before Oirechtas Media Committee
Kildare-Based Ambulance Service CEO Criticises HSE After NAS Workers Allege Harassment And Misogyny
Gerry Hutch's Son Remanded In Custody For Organised Crime Charge
Ryanair Boss Stands By His Comment Comparing Other Airlines To Rapists
The European Central Bank Announces Interest Rate Increases
Gardaí And Europol Investigate Horse Trafficking In Kildare And Other Counties
Vice Chair Of Kildare Club Believes GAA Are "Seriously Lacking Leadership"
Kildare Highlighted As Having Highest Suicide Rate In Ireland