Shakespeare wrote about “the infant mewling and puking in the nurse’s arms” when describing the first stage of life.  Spitting was common then and it’s common now—affecting all babies.  But obviously some more than others.  My colleague, Dr. Ben Gold, an expert in the field, lists 3 causes:

  1. A smaller stomach,
  2. A less stretchable stomach, and
  3. The angle the stomach and esophagus make with each other is less than 90 degrees.

I add a 4th:  The strength (or tone) of the valve (the lower esophageal sphincter) between the esophagus and stomach.

The standard formula for babies who aren't breastfed combines cow's milk proteins with vegetable fat, lactose, and all the known vitamins and minerals that are in breastmilk in order for the formula to mimic not only what's in breastmilk but also to come close to providing the growth and development that breastmilk creates. As a result, two fatty acids, DHA and ARA are added to mimic their stimulate development of the brain and eyes (These are discussed in detail in another blog post).