Either breast milk or cow's milk, depending on the brand or if the baby likes it or not.
Step-by-step explanation:
Formula isn't the best food for baby's since its hard for them to swallow, formula is thicker than breast milk or cow milk. Baby food can come later, when you are sure that the baby can chew and swallow mashed food. Breast milk isn't hard to swallow, same with cow milk. Depends on what the mother eats, the healthier foods the better. Wouldn't recommend smoking or alcohol, cow's milk has a better taste but may have less vitamins and nutrients depending from which cow it comes from and the brand. Breast milk doesn't have a good smell but is full of vitamins and nutrients.
