What is a common symptom associated with Sudden Infant Death Syndrome (SIDS)?

Sudden Infant Death Syndrome (SIDS) is a term used to describe the unexplained death of an infant, usually during sleep, and it typically occurs in infants under one year of age. One of the common symptoms that has been observed in some cases prior to a SIDS event is the presence of bloody or frothy vomit or mucous. This can indicate a physiological distress that could be associated with respiratory or other underlying issues affecting the infant, even though the exact causes of SIDS remain unclear.

While high fever, excessive crying, and cold extremities might be symptoms of other conditions affecting infants, they are not specifically linked to SIDS in the same way that the presence of bloody or frothy substances may be observed. Understanding the physiological signs that can manifest is important in recognizing distress, but SIDS itself is complex and involves more than just the immediate symptoms seen. Thus, the correct answer highlights a notable sign that may precede a SIDS incident.