Postconceptional age | |||||
20 weeks | 25 weeks | 30 weeks | 35 weeks | 40 weeks | |
Mouth | Salivary glands | Swallow reflex present | Lingual lipase | Sucking reflex present | |
Esophagus | Muscle layers present | Striated epithelium present | Poor lower esophageal sphincter tone | ||
Stomach | Gastric glands present | G cells appear | Gastric secretions present | Slow gastric emptying | * |
Pancreas | Exocrine and endocrine tissue differentiate | Zymogen present | Reduced trypsin, lipase | * | |
Liver | Lobules form | Bile secreted | Fatty acids absorbed | * | |
Intestine | Crypts and villi form | Glucose transport present | Dipeptidase, sucrase, and maltase active | Lactase active | |
Colon | Crypts and villi recede | Meconium passed |
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