Physiologic Factors that Influence the Oral Absorption of Medications in Neonate, Infant & Child

PARAMETER	NEONATE	INFANT	CHILD
Gastric acid secretion	Reduced	Normal	Normal
Gastric emptying time	Decreased	Increased	Increased
Intestinal motility	Reduced	Normal	Normal
Biliary function	Reduced	Normal	Normal
Microbial flora	Acquiring	Adult pattern	Adult pattern

Reference:
Nelson Textbook of Pediatrics 18th Edition