Fibre is just cellulose basically. An undigestable sugar. As it can’t be digested, it causes water to move out into the intestinal lumen by osmosis (water flowing into a place of high solute concentration vs water, to balance out the concentration gradients) leading to loose water stools. This is a big problem because babies have such small volumes, even a bit of excess GI fluid loss can lead to life threatening metabolic disorders due to electrolyte imbalances. For babies it’s recommended fatty food is given as this travels through the GI tract slowly and can be fully absorbed along with water and other nutrients
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