Du'a for your children from the Qur'an: Surah Al-Ahqaf (15)

رَبِّ أَوۡزِعۡنِيٓ أَنۡ أَشۡكُرَ نِعۡمَتَكَ ٱلَّتِيٓ أَنۡعَمۡتَ عَلَيَّ وَعَلَىٰ وَٰلِدَيَّ وَأَنۡ أَعۡمَلَ صَٰلِحࣰا تَرۡضَىٰهُ وَأَصۡلِحۡ لِي فِي ذُرِّيَّتِيٓۖ إِنِّي تُبۡتُ إِلَيۡكَ وَإِنِّي مِنَ ٱلۡمُسۡلِمِينَ

Rabbi awzi'nee an ashkura ni'matakal-latee an'amta 'alayya wa 'alaa waalidayya wa an a'mala saalihan tardaahu wa aslih lee fee dhurriyyatee, innee tubtu ilayka wa innee minal muslimeen

My Lord! Arouse me that I may give thanks for the favour wherewith Thou hast favoured me and my parents, and that I may do right acceptable unto Thee. And be gracious unto me in the matter of my seed. Lo! I have turned unto Thee repentant, and lo! I am of those who surrender (unto Thee)

Qur'an 46:15 (Al-Ahqaf)