Du'a for children's beneficial knowledge

اللَّهُمَّ انْفَعْهُمْ بِمَا عَلَّمْتَهُمْ، وَعَلِّمْهُمْ مَا يَنْفَعُهُمْ، وَزِدْهُمْ عِلْمًا

Allahumman-fa'hum bima 'allamtahum, wa 'allimhum ma yanfa'uhum, wa zidhum 'ilma

O Allah, benefit them with what You have taught them, teach them what will benefit them, and increase them in knowledge.

Adapted into the plural for children from Sunan al-Tirmidhī 3599.