بِسْمِ اللَّهِ اللَّهُمَّ جَنِّبْنَا الشَّيْطَانَ وَجَنِّبِ الشَّيْطَانَ مَا رَزَقْتَنَا
Bismillah, Allahumma Jannibna-sh-Shaitan, Wa Jannibi-sh-Shaitana ma Razaqtana
I am having relations in the name of Allah. O Allah save us from Satan and keep him away from the children You grant us. The child that is born after the recitation of this dua will never be harmed by Satan
Sunan Abi Dawud: 2161