You have not mentioned weight and height . So I’m presuming it is below the expected weight and height for that age. Decreased hunger can be due to over feeding , constant nagging by care giver, constipation , and due to boredom because of decreased variety of food made at home.
Next Steps
Protein intake in food increases weight of a child.Ghee, fruits like banana and mangoes , eggs , milk , protein powders can be added to milk .
Health Tips
Natural appetite increasing syrups are available in the market and can be given for 15 days . But these are not permanent solutions