Hello all - 
  I also looked at this question posed by Morgan and here's my result:
   
  Morgan,
  By simple ratios, here is what I got.  (I was too curious to let it rest)
  Baby capacity - 15ml
  Baby overload - 90ml (3 oz)
  Adult capacity - 900ml
  Adult overload - 5400ml (or a little over a gallon and 1/4 !)
   
  Here's the math:
  15ml(baby tummy)/90ml(baby overload) = 900ml(adult tummy)/x  Cross multiply to get
  15x=81000
  x=5400
   
  Note: If you only gave 2oz of formula, the overload amount for an adult would be 3400ml, only slightly more reasonable.
   
   
  Stomach capacities are based on a google search - stomach capacity-adult that gave the following reference:
  
  Silverman, WA, ed. Dunham's Premature Infants, 3rd edition. New York: Hoeber, Inc., Medical Division of Harper and Brothers, 1961, p. 143-144.
  

  Basically the stomach capacities are:
    
     Day 1: 5-7 ml, size of small glass marble, hazelnut, or thimble (In the womb babies swallow amniotic fluid one swallow at a time, every once in a while. That's all the volume they are used to having in their stomachs at any one time, just a swallow or two. Maybe this is why lots of formula fed babies spit up a lot the first day or they just refuse to take more than a few swigs each time they eat)
  
     Day 3: 22-27 ml, about 1 oz, use the baby's own fist, it's a great ready-made visual for the parents! You could also use a shooter marble.
  
     Day 10: 45-60 ml, about 1.5 oz to 2 oz, size of a walnut, golf ball, or ping-pong ball
  
     Adult: 900 ml, about 2 cups, the size of softball, grapefruit, tennis ball, adult fist

  Hope that helps!
  :)
Sara Munday RN (math geek and aspiring IBCLC)


       
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