My son eats air too. It’s normal. I got him a compartment plate and I just fill it with different things; fruits, veggies, meats, snacks (like trail mix or chips, crackers), cheese, sandwiches ect. I leave it out all day and add or remove items. He eats when he wants and chooses what he eats. Works great :) baby charcuterie all day
May be your child was not hungry at that time. Try giving the particular food some other time of the day and in other forms. Like my daughter doesn't like avocado on its own, so I give her by mixing with banana or by spreading banana and avocado on bread slice. Hope it works for you 😁