Du'a for children's heart via Qur'an

اللَّهُمَّ اجْعَلِ الْقُرْآنَ الْعَظِيمَ رَبِيعَ قُلُوبِ أَوْلَادِي، وَشِفَاءَ صُدُورِهِمْ، وَنُورًا لِأَبْصَارِهِمْ

Allahumma-j'alil-Qur'anal-'adhima rabi'a qulubi awladi, wa shifa'a sudurihim, wa nuran li'absarihim

O Allah, make the Great Qur'an the spring of my children's hearts, the healing of their chests, and a light for their sight.

Adapted into the plural for children from Musnad Aḥmad 3712.