ब्रिस्टल यूनिवर्सिटी के शोधकर्ताओं ने किया दावा
source https://www.bhaskar.com/happylife/news/smoking-during-pregnancy-linked-to-childs-risk-of-having-congenital-heart-disease-128555274.html
source https://www.bhaskar.com/happylife/news/smoking-during-pregnancy-linked-to-childs-risk-of-having-congenital-heart-disease-128555274.html