There can many reasons for avoiding food by him.Consult Peaditrician to get the proper reason of not eating food & get treatment for cough also.

Generally pediatrician dont recommend any sort of sugar or any form of sugar for baby below 1 year.rest its ur wish.

Weight is good...

Jus give whatever you have,give fruits, vegetables, greenleafy,dairy products,pulses...

Jus give whichever tastes he likes,
Avoid giving packaged foods...

Hi you can wait for 1-2 months more

Hi you can try alternative option in veg, like pulses, soyabean or you can give egg too

Hi give nasal saline drops in both the nostrils and suck it back with nasal bulb to clear the airway and stuffed nose and use humidifier in baby room to provide humidification and give lots of fluids in the diet for hydration

Hi instead of this give only simple homemade food which is easily digestible

U can add pediasure,dry fruits powder,only almond powder, dates syrup ,honey,oats, add fruits & make milkshakes,carrot shakes etc.Adding a bit turmeric is also good.

May b she not feeling hungry in 2 hr gap after having one meal.In between three main meals give small eatables like fruits , egg, or what usually give only when she feels hungry.For e.g. after having breakfast Give next eatable when she feels hungry.It may longer than 2 hr or less than 2 hr to get hungry for her & Keep changing her meals by giving something new to eat so that she gets an interest in having something new.Hunger will depend upon how much she eats at one time or she may not b feeling hungry till she poops.

Hi no give only simple homemade food whatever you eat to have adequate nutrition