Imam believed that children should be taught right and wrong and Islamic laws before they became Baaligh.
Occasionally Imam would ask my 8 year old son, "Have you said your prayers?" I would reply, "Agha, he is not as yet Baaligh." Imam would say, "Children should form a habit of praying before they become Baaligh."
Each time Imam would see a child, he would ask, "Have you prayed?" If the child had not prayed, he would give them his own prayer mat and would say, "Go and do your wudhu and quickly say prayers." After they had finished praying, he would say, "How much better it would have been had you prayed on time. Allah would have been more pleased."
(A memoir by Mrs Fatema Tabatabai - Imam's daughter in law)