Yes, your paediatrician is right. Reduce the milk and take him for meals along with you. Be firm on having home diet, you can make it little semisolid by mashing. Don't scold or punish. He will come around.
Ramkrishnhari, may be due to Hyperacidity, indigestion she is hving. Pl. Give her
1 teaspoon ginger juice +1 teaspoon honey mix it give 1/4 teaspoon 3 times a day. You hv not mentioned your city. Pl. Consult Ayurvedic consultant nearby.