kāṣṭhābhir iva so 'nvaham

sah-that; raja-putrah-the royal prince; vavrdhe-grew up; asu-very soon; sukle-waxing moon; iva-like; udupah-the moon; apuryamanah-luxuriantly; pitrbhih-by the parental guardians; kasthabhih-plenary development; iva-like; sah-he; anvaham-day after day.