Which one of the following factors is associated with a higher incidence of SIDS?

Low birth weight is associated with a higher incidence of Sudden Infant Death Syndrome (SIDS) because infants who are born with lower weight may have underdeveloped systems that make them more vulnerable to risk factors associated with SIDS. These infants often demonstrate increased susceptibility due to factors such as immature respiratory and cardiovascular systems, which can lead to challenges in maintaining proper physiological functioning during sleep.

In contrast, the other options are associated with protective factors against SIDS rather than increased risk. Frequent doctor visits typically indicate better healthcare access and regular monitoring, which can help in identifying and addressing potential health issues early on. Exclusive breastfeeding has been shown to reduce the risk of SIDS, likely due to a combination of factors including nutritional benefits and closer mother-infant bonding. The use of a pacifier during sleep is also linked to a reduced risk of SIDS, as it may help maintain an open airway and prevent the infant from rolling onto their stomach during sleep.

Thus, the strong association of low birth weight with SIDS highlights the importance of comprehensive prenatal care to ensure optimal infant health.