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One of the baby's organs that has a characteristic evolution in the first weeks and months after birth is the stomach. This evolution can be observed in two very different areas due to the different functions that the stomach performs: its size evolves, due to the increase in the baby's energy needs, and its microbiota evolves, due to its involvement in the development of the immune system. This is how the baby's stomach evolves.
In the first place, the newborn has a very small stomach, approximately the size of a marble, and can hold approximately 5ml of milk, hence the colostrum is produced in small quantities and babies demand food every so often.
The growth of the stomach during the first days is amazing, becoming 20 times higher than that of the newborn in approximately two weeks. In reality, the stomach grows little by little and steadily, as well as the amount of milk progressively increases, passing from colostrum to transitional milk and then to mature milk.
- The baby's stomach reaches approximately the size of a walnut, about 25ml, after 3-4 days
- The size of a plum, about 50 ml, per week
- One egg, 75 ml, at 10 days and so on.
However, if the baby is forced to eat more than he needs, giving him a little help with a bottle of formula milk at the end of the breast because the breast milk is not enough or does not feed him, or offering him more milk from formula you should really take, we force your stomach to grow faster and longer than it should naturally.
The newborn baby's stomach is lined with a microbial population inherited from the mother, since during pregnancy, bacteria from the maternal intestine continually reach the amniotic fluid, crossing the placental barrier. This amniotic fluid is ingested by the baby and filtered by his kidneys, going through his entire digestive system and settling in it, forming a kind of protective biofilm.
These bacteria are in direct communication with the brain through a bidirectional relationship between neuronal connections and the gut microbiota itself. Scientists postulate that these bacteria could constitute the first stimulus for the development of the baby's immune system, protecting against allergies, asthma and other diseases, its correct evolution being very interesting.
Although until birth it is the maternal diet and its microflora that directly influence the bacterial population that the baby will obtain, after birth it is their own diet that exerts this influence.
Breast milk contains beneficial bacteria for this microbiota, bacteria that help the immune system to evolve by settling in the baby's stomach, while formula milk is sterile, causing the microbial population of children fed with it not to evolve in the same way.
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