As your 3-4 year old is growing up fast so is his mind, he can now easily learn, memorize and remember the poems that are taught to him in school and at home. He will easily recite those songs and poems as well.
What you need to know
Your child's memory is at a rapid growth at this stage. Give him more and more story books, listen to a lot of rhymes with him and make him learn new ones. This will also develop his interest in reading and listening. This in turn will enhance his memory power as well. Show him a lot of new poems that have pictures so that he will have more interest in going back to that poem again and again.