Mr. Kamal
His 1st cusp (self) sub lord is Moon in 6th house, a watery sign and Moon in the star of Mercury in a watery sign. It indicates that the constitution is weak and prone to diseases easily. You do not worry about the weight of your elder son. He will put up weight after 24-11-2025.
His 2nd cusp (speech) sub lord is Venus. Venus is the lord of 1st and 8th in 12th house. Venus is signifying his star lord Sun in a watery sign and Jupiter in 1st house (an airy sign). So the boy could speak well in Venus and Jupiter period. Next bhukti is also co-operative. But he picks up and speaks slowly.
Good Luck
JVS Rao (KP follower)