Risks of Bacterial Contamination of Infant Formula: French Recommendations Differ from WHO Guidelines. What Are the Health Risks for Newborns? Lactasource is a breastfeeding information resource, but we feel it is important today to address the topic of bacterial contamination of infant formula (powdered infant formula). Indeed, some breastfed infants may require supplementation with infant formula, or parents may choose a mixed feeding approach: breastfeeding alongside formu