Here are some introductory reading material on breastfeeding and complementary feeding or weaning, from the WHO website.
The Baby Friendly Hospital Initiative
The International Code of Marketing of Breast Milk Substitutes
The U.S. Breastfeeding Committee has a succinct article on the benefits of exclusive breastfeeding with cute pictures of babies (i.e. read this if it is the only article you have time for!)
The Benefits of Breastfeeding
These are links to some longer articles which we will reference in our presentation.
Nutrient Adequacy of Exclusive Breastfeeding (WHO)
Breastfeeding and Persistent Diarrhea (WHO)
HIV and infant feeding (WHO)
And finally, a really interesting UNICEF video on initiating breastfeeding, entitled "Breast Crawl" (6 minutes). Original link here if the video doesn't work.