Infants and children have several anatomic and physiologic differences compared to adults.Gastrointestinal System: Infants and children have a shorter digestive tract than adults, which can affect the absorption of nutrients and medications.Organ Function: Infants and children have organs that are still developing, such as the liver and kidneys, which can affect how medications are processed and eliminated from their bodies.Respiratory System: Infants and children have smaller airways than adults, which makes them more prone to respiratory infections and can make it more difficult for them to breathe.Here are some of the key differences: 1.2.3.4.5.6.7.