Mixed Feeding

California Department of Health Services, Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) – Getting Ready for Childcare
http://www.wicworks.ca.gov/breastfeeding/EmployeeResources/ReadyforChildcare.html
http://www.wicworks.ca.gov/breastfeeding/EmployeeResources/ReadyforChildcare.pdf

Abstract
Breastfeeding mothers are encouraged to identify child care providers supportive of breastfeeding and begin introducing bottles for feedings prior to returning to work. Staff and pregnant and breastfeeding mothers receive useful information about how to introduce bottles to breastfed infants. It is recommended for someone other than the breastfeeding mother to use bottles to feed the infant.