First, the baby   will be screened at birth in most USA hospitals for what 
are called inborn errors of metabolism (Galactosemia is one  of those).

Second, they need to avail themselves of genetic counseling before 
pregnancy.  If already pg, both parents can be tested.  Both parents have to 
carry this recessive gene to have an affected baby.  They need to 
investigate this and learn all the ins and outs of how this is passed on.

Third, if are already having a baby, and somewhere testing isn't done, they 
could ask for testing as soon as baby is born specifically for Galactosemia.

Hope this helps 

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