Dad- Well Appu, for someone who spent the first year of his life saying GU, you could say GREEN, or at least GEEN.
Appu (happy)- NEEN!!
Dad- No no, Appu. GEEN.
Appu (still happy)- NEEN! NEEEN!!
Dad- G-G-G-G... GEEN!
Appu (very happy)- G-G-G-G-G!!
Dad- GA-GU-GU-GA-GU... GEEN!
Appu (ecstatic)- GA-GA-G-G-GU-GA-GU... NEEN!