Here's the deal:
Jaundice is mainly a problem for breastfed infants who do not feed well. 
I've posted before about this.

When starvation occurs, the infant stops stooling (which allows the 
bilirubin in the meconium hanging out in the intestines to be 
unconjugated by bacteria, which allows the bilirubin to go back into the 
bloodstream through the enterohepatic circulation.)

Breast milk does not inhibit the enterohepatic circulation, because 
under usual circumstances, bilirubin is helpful to the infant, acting as 
a powerful antioxidant. Hydrolyzed casein does. This is the reason 
behind the AAPs recommendation that dehydrated breastfed infants with 
high risk bilirubin levels receive small amounts of hydrolized formula 
while they are being treated for jaundice. Enzymatically hydrolized 
casein is the main protein in nutramigen and alimentum, whereas 
whey/casein is the main protein in enfamil. Nutramigen and enfamil are 
both Mead Johnson products.

This is a helpful study, because it showed that the L-aspartic acid 
group had the most elimination of bilirubin. This gives us a better 
option than hydrolized casein, so we can avoid exposing babies to 
foreign cow proteins, however broken down to inhibit their enterohepatic 
reabsorbtion of bilirubin. Now if we just had better breastfeeding 
assistance in the hospital, we would have fewer babies who would need 
this treatment (just the preterm ones, the ones with genes that reduce 
the efficiency of bilirubin conjugation, the ones with hemolytic 
disorders....)
Catherine Watson Genna, IBCLC  NYC

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