Ros asked for some references supporting continued feeding during diarrhea.
 Here's a couple that might help:

Haffejee, Ismail E. Cow's Milk-Based Formula, Human Milk, and Soya Feeds in
Acute Infantile Diarrhea: A Therapeutic Trial.  Journal of Pediatric
Gastroenterology and Nutrition, 1990. 10:193-198

"....in the case of rotaviral GE, continuation of breast-feeding during the
illness significantly shortens the duration of the diarrhea when compared
to continuation of cow's milk-based formula feeds."


Walterspiel JN et al. Secretory Anti-Giardia lamblia Antibodies in Human
milk: Protective Effect Against Diarrhea.  Pediatrics 1994. 93 (1):28-31.

"...anti-Giardia sIgA in human milk protects against symptoms of
giardiasis, but not against colonization..."
"The finding of a significant association between anti-Giardia secretory
IgA in human milk and prevention of diarrhea due to Giardia adds to the
evidence of a protective role of specific sIgA against giardiasis and
further strengthens the importance of breast-feeding infants to prevent
diarrheal disease."

As I understand it, the infants in this study were infected with giardia
but did not show symptoms of diarrhea while breastfed, the way the babies
on formula did.

Anne Altshuler, RN, MS, IBCLC and LLL leader in Madison, WI