What is the best long-term instrument for my child in India?

“For daughters: Sukanya Samriddhi Yojana (SSY). It currently pays ~8.2% tax-free, among the highest rates in the small-savings basket, though the Ministry of Finance resets these quarterly. For both daughters and sons: PPF in the child's name (7.1% tax-free) and an equity mutual fund SIP via minor account with parent as guardian. Most families use a combination.”