Thank you for your query on Healthcare Magic.
The cause for decreased appetite in children around this age group is because of decreased growth rate physiologically.
You should be patient while feeding.
Don't force to feed him rather use some tricks while feeding.
Give him spoon and ask him to feed himself and you try to feed with another spoon.
Make him to sit on high chair at dining along with the family members and ask him to feed himself.
Nothing to worry if child is healthy and active.
You can use a multivitamin
syrup in prescribed dose.
Hope I have answered your query.