We seek protection from Allah s.w.t, the All-Protecting and the All-Knowing. Prophet Muhammad s.a.w. used to seek Allah's protection for Al-Hasan and Al-Husain by reciting this Dua. It is also encouraged to say a prayer with Allah's Names.
أُعِيذُكُمَا بِكَلِمَاتِ اللَّهِ التَّامَّةِ مِنْ كُلِّ شَيْطَانٍ وَهَامَّةٍ، وَمِنْ كُلِّ عَيْنٍ لاَمَّةٍ
U'izukuma bikalimatil-lahit-tammati min kulli shaytanin wa hammah, wa min kulli 'ainin lammah.
“I seek protection for you in the Perfect Words of Allah from every devil and every beast, and from every envious blameworthy eye.”
In this Dua, we seek protection from Allah s.w.t. against the devils, any poisonous creature, as well as the evil eye, which is a misfortune or harm that is caused by the sight of a person out of envy or jealousy.
The Prophet s.a.w. warned us about the evil eye, especially towards our own self.
إِذَا رَأَى أَحَدُكُمْ مِنْ أَخِيهِ أَوْ مِنْ نَفْسِهِ أَوْ مِنْ مَالِهِ مَا يُعْجِبُهُ فَلْيُبَرِّكْهُ فَإِنَّ الْعَيْنَ حَقٌّ
“If one of you sees something from his brother, or in himself, or in his wealth which impresses him, then supplicate for it to be blessed with. Verily, the evil eye of envy is true”
Therefore, when we happen to come across something that impresses us, we should mention the name of Allah and make supplications for it to be blessed.
Here are other beautiful duas you can read for your children.