You can give Luke warm meals like sheera,  karada,  soup,  besan wala dhood, khichaddi with ghee,  Daliya etc.  Avoid oily and spicy food.

avoid cold , citrus and oily food.

When baby is unwell especially when the throat or the respiratory system is involved they are not very keen to eat much. They prefer to drink instead. Offer different variety of soup, juices, milk etc for a few days till the baby settles down. Other foods can be offered as per baby's preference.

give turmeric milk... rava upma.. soups..

avoid any food that may be citrus in nature. go bland for some days. warm soups may also help.