Yes there are studies that show a decrease in asthma in breastfed children.
A recent study at King Edward Memorial Hospital (Perth) demonstrated that
children were 30% less likely to develop asthma and 40% less likely to
develop other atopic allergies such as rhinitis and hayfever is they were
breastfed.

A review article on alergy and breatmilk upto 1998 is Hanson LA,
Breastfeeding provides passive and likely long-lasting active immunity.
Ann Allergy Asthma Immunol 1998 Dec 81:6 523-33.

Christine.

             ***********************************************
The LACTNET mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software together with L-Soft's LSMTP(TM)
mailer for lightning fast mail delivery. For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html