Prayers and Children
عَنِ الْبَاقِرِ (ع) قَالَ: إِنَّا نَأْمُرُ صِبْيَانَنَا بِالصَّلاَةِ إِذَا كَانُوا بَنِي خَمْسِ سِنِينَ فَمُرُوا صِبْيَانَكُمْ بِالصَّلاَةِ إِذَا كَانُوا بَنِي سَبْعِ سِنِينَ
Imam Muhammad Baqir (A.S) advised: “We command our children to offer prayers when they are five years old, so you too order your children to offer prayers (but only) when they are seven years of age.”
Wasa’ilush Shi`a, Volume 3, Page 12
Other links:
Dua’a is the Gist of Prayer