Final answer:
Breastfeeding does not directly decrease the incidence of sleep disturbances in infants.
Step-by-step explanation:
The correct choice that is not a benefit for breastfeeding infants is option C. Decreased incidence of sleep disturbances. While breastfeeding has numerous benefits for infants, such as boosting their immune system, providing necessary nutrients, and reducing the risk of infections and allergies, it does not directly decrease the incidence of sleep disturbances. Breast milk does contain components that can help with sleep regulation, but the act of breastfeeding itself does not guarantee a decreased incidence of sleep disturbances.