Seeking refuge for children
أُعِيذُكُمَا بِكَلِمَاتِ اللَّهِ التَّامَّةِ مِنْ كُلِّ شَيْطَانٍ وَهَامَّةٍ وَمِنْ كُلِّ عَيْنٍ لاَمَّةٍ
Transliteration
U'idhukuma bikalimatillahi-tammati,min kulli shaitanin wa hammatin, wa minkulli'ainin lammah
Translation
I seek refuge for both of you in the perfect words of Allah from every devil and every poisonous thing and from the evil eye which influences
How
The Prophet used this to seek refuge for his grandsons al-Hasan and al-Husayn.
Source: Sunan Abi Dawud 4737. Full details