Can I use formula to make pudding for my baby?

I've seen recipes that uses formula or milk to make puddings for babies. Here is one: Chocolate banana custard Ingredients - 1 tsp cornflour - 1 tsp drinking chocolate (powder or granules) - 100ml full-fat cow's milk or formula - 1 small banana Method Mix together the cornflour, chocolate powder, and milk, and heat in a microwave for one minute to two minutes until thickened. Alternatively, heat gently on the hob, stirring frequently. Chop or mash the banana and serve with the custard. Taken from: http://www.babycentre.co.uk/a546659/baby-food-recipes-puddings-from-six-months