These pancakes can be made without baking powder too, although baking powder makes the batter thick and yields soft pancakes.
If the apple is sweet then you can skip the sugar.
Instead of apple, you can also add mashed banana to the batter. Elaichi powder can also be added for extra flavor.
You can also cook these pancakes without sugar, adding it later if needed.
For toddlers and adults, water can be substituted for milk in the same recipe.