I would suggest if you want to give cow milk then give toned milk without a dilution, and I would suggest to concentrate more on the food than on the milk. If you want to give, then you can give milk products like paneer and curd.
Next Steps
Please give proper three times meal along with two snacks and if the child is still hungry, you can give your breastmilk and after that you can give cow milk or any other toned milk