بِسْمِ اللهِ اللَّهُمَّ جَنِّبْنَا الشَّيْطَانَ ، وَجَنِّبِ الشَّيْطَانَ مَا رَزَقْـتَنَا
Translation 
In the Name of Allah. O Allah, keep the shaytaan away from us and keep the shaytaan away from what You have blessed us with.
Note: *The Messenger of Allah [May the Peace and Blessings of Allah be upon him] said: whoever says this Dua and the wife was pregnant from that night, Shaytan will never be able to harm the child.
Transliteration
bismillaah - allaahumma jannibnash-shayṭaana, wa jannibish-shayṭaana maa razaqtanaa
