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The following are the growth parameters for the age 3and half years.
Parameter Expected Actual Inference
Height 92-98 cm 95 cm With in normal limits
weight 15-18 kgs 11.5kg less than expected
Head Circumference around 47-48 cm 47cm with in normal limits
Based on the above chart your child has poor weight gain ( the expected weight is based on the birth weight
which is considered as 3 kg) and other parameters are normal.
Yes, head circumference does increase after 3 years, but it will be slow. At the age of 3 years head circumference should be 47cm and reaches maximum of 52cm by the age of 12 yrs.
EN does help in improving appetite.
Give your child a healthy diet. Give him plenty of fresh fruits. Give him banana and citrus fruits instead of an apple.
Provide him more pulses. If you take non vegetarian diet i would like to recommend to give him 2 eggs daily .
Hope your son recovers soon.