At what age do babies have increased levels of digestive enzymes, making it suitable to introduce solid foods?

Four to six months

Explanation:

From four to six months old, the baby's body begins to change and has increased levels of digestive enzymes, so the child's nutritional needs change and breast milk needs to be supplemented with solid foods. Even if the baby only takes formula (artificial milk), not breast milk, it is recommended to wait until six months to give other foods, although from four months babies begin to increase their number of digestive enzymes.