What are the different types of infant formulas and their characteristics?

Infant formulas have been developed to meet the nutritional needs of infants who are not breastfed or who are partially breastfed.
Infant formulas are regulated by scientific organizations to ensure their safety and nutritional adequacy.
Infant formulas can be made from cow's milk, soy, or other sources of protein.
Infant formulas can be designed for specific needs, such as premature infants or those with allergies or digestive issues.