Caecum, ileum and jejunum in infants, pediatrics. At birth, the folds of the intestine are fewer and less marked than that of adults. The muscle fibers of the large intestine are immature. The ascending and descending colons are short. While the transverse colon is long. The mucosa is very smooth and the haustrations appear only in the first 6 months of life. Food passes through the intestines very quickly. And have low absorption capacity. So the stools are soft. While in adults, the transit is longer and the absorption greater. As a result, the stools are harder.