Hello, Welcome to HCM, Young children are sometimes difficult to feed, I suggest you to be patient,try different food items and avoid junk foods like chocolate and chips, because they interfere with appetite. Try to feed him with all family members,let him feed himself. Give plenty of fluids,glucose water and fruits. If he is feeding breast milk, continue to feed him along with supplementary food. Even though practin syrup increases appetite and weight gain, use Practin syrup with caution, because it has antihistamine and it will cause drowsiness. Thank you, I wish you a healthy baby.