The "PKU" test done on all newborns in the USA is actually serveral different
tests looking for genetic disease.  If the doc wants to start soy formula I
assume the screen for galactosemia was positive.  Galactosemia is the one
absolute contraindication to breastfeeding.  Human milk sugar is lactose.
Lactose is glucose + galactose.  If you do not have the enzyme to metabolize
galactose you have galactosemia.  The galactose builds up in all your tissues
and causes catarracts, brain damage and failure to thrive.
Nancy Wight MD, FAAP, IBCLC

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