Answered by Sayyidi Habib Umar bin Hafiz (may Allah protect him and benefit us by him)
What can we read to protect our children?
Read over them Ayat al-Kursi, Surat al-Ikhlas, Surat al-Falaq and Surat al-Nas and then the following duas:
أُعِيذُكَ بِكَلِماتِ اللهِ التَّامَّةْ مِنْ كُلِّ شَيْطانٍ وهَامَّةْ وكُلِّ عَيْنٍ لامَّةْ
U`idhuka bi kalimatillahi’tammah, min kulli shaytanin wa hammah wa kulli ‘aynin lammah
I seek refuge for you in the complete words of Allah from every devil, every creature and every evil eye.
[Ibn `Abbas narrates that the Prophet ﷺ used these words to protect al-Hasan and al-Husayn and he would say, “Your father (Ibrahim) used these words to protect Isma’il and Ishaq.]
حَصَّنْتُكَ بالحَيِّ القَيُّومِ الّذي لايَموتُ أبَدَاً ودَفَعْتُ عَنْكَ السُّوءَ بِأَلْفِ أَلْفِ اَلْفِ لا حَوْلَ و لا قُوَّةَ إِلا باللهِ العَليِّ العَظِيمِ
Hassantuka bil-Hayyi’l Qayyum, alladhi la yamutu abadan wa dafa’tu ‘ankassu’a bi alfi alfi alfi la hawla wa la quwwata illa billahi ‘Aliyyi’l `Azim
I place you in the protection of the Living the Self-Sufficient who never dies and I drive evil away from you with “there is no strength nor might except in Allah the Sublime the Almighty” a billion times over.
Note: the pronoun used here is for a singular male. If you are reading it for a girl replace the “ka” with “ki” and if you are reading it for more than one child use the plural “kum.”