Usually an infant is ready to eat solid food, both in growth and psychologically, at the age of 6-9 months. When solid foods already given before baby's digestive system is ready to accept, the consequence may occur is the food isn’t digested properly and can cause unpleasant reactions (digestive upset, the emergence of gas, constipation, etc.). Infant's body has not had complete protein / enzyme digestion. Gastric acid and pepsin removed at birth and only in the next of 3 to 4 months it has increased close to the amount for adults. Amilase enzyme produced by the pancreas has not reached sufficient numbers to digest roughage until about 6 months of age. Carbohydrates digestive enzymes such as maltase, isomaltase, and sukrase has not reached the adult level before 7 months. Infants also have a number of lipase and bile salts in very small amounts, so that the digestion of fat has not reached the adult level before the age of 6-9 months.
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