Pregnancy and Breastfeeding

U.S. Department of Health and Human Services, Office on Women's Health – Coping with Breastfeeding Challenges: Breastfeeding During Pregnancy
http://www.4woman.gov/breastfeeding/index.cfm?page=229#during

Abstract
Breastfeeding a toddler while pregnant is possible and does not compromise the health of the unborn child. Staff and pregnant and breastfeeding women learn how pregnancy affects breastfeeding for women and toddlers. If women experience problems during pregnancy, their healthcare provider may recommend weaning toddler.