The amount and frequency of feeding the baby depend on their age. As the baby begins eating solid food, how much and how often is necessary and doable will increase as they get older. To start, feed the baby 1 to 2 tablespoons of food twice a day and amp that up naturally as they grow older, always only until full (source).
For the period between the fourth and the sixth months, only serve solids as a snack. Later, when purees, chopped, and finger food become the main dish, breast milk and formula are just a side but still required.