If she isn't eating gluten, she can't make antibodies. I think the <6 means that some people may make a tiny bit or more likely, its just a margin of error in the test. A 1 wouldn't mean anything.
http://www.curecelia...-celiac-disease
"At what age should children get tested for celiac disease?
Generally, children are screened for celiac disease at age 2 or 3 unless symptoms are seen beforehand. In children younger than 3, with symptoms, antibody testing may not always be accurate. Children must be eating wheat or barley-based cereals for some time, up to one year, before they can generate an autoimmune response to gluten that shows up in testing. A pediatric gastroenterologist should evaluate young children experiencing a failure to thrive or persistent diarrhea for celiac disease."
http://www.curecelia...n-breast-milk-2
"Is gluten found in breast milk?
There is little to no human research about the effect of gliadin, which is the portion of gluten that passes through breast milk. However, in animal studies it has been shown to have a protective effect, or help the child build up a tolerance to gluten.
We don’t know for certain, but the best evidence we have indicates that a child who is at risk for celiac disease being breastfed by a mother who eats a normal diet would not be harmed by this, and in fact, might be helped.
Regardless, we do know when it is best to introduce gluten into the at-risk child’s diet. For more details on that, please see our Winter 2010 newsletter."
Celiac.com - Celiac Disease Board Moderator
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