Which of the following is NOT a typical risk factor for SIDS?

Breastfeeding is recognized as a protective factor against Sudden Infant Death Syndrome (SIDS), rather than a risk factor. Research has shown that infants who are breastfed have a lower incidence of SIDS compared to those who are formula-fed. The protective effect is thought to stem from several factors associated with breastfeeding, including its role in providing optimal nutrition, promoting bonding between the mother and child, and possibly enhancing the immune response of the infant.

In contrast, placing infants on their stomachs to sleep, exposure to smoke (either maternal smoking during pregnancy or secondhand smoke), and socioeconomic factors such as being from low-income families have all been associated with a higher risk of SIDS. Hence, while those other factors are critical in understanding SIDS risk, breastfeeding serves to mitigate the risk and promote healthier outcomes for infants.