Final answer:
Symptom analysis is not part of the past medical history in a pediatric health history; it relates to current symptoms rather than past medical events. The other options given are indeed part of a child's past medical history.
Step-by-step explanation:
The component that is not a part of the past medical history in a pediatric health history is a. Symptom analysis. Symptom analysis typically relates to the current reasons for the visit and involves gathering detailed information about the symptoms the child is currently experiencing, rather than past medical events. The other options - b. Allergies, c. Birth history, and d. Current medications - are all crucial elements of past medical history. Allergies provide insight into any adverse reactions the child may have had, birth history can inform of any issues or challenges at the time of birth, and current medications indicate what treatments the child is receiving now, which may have been initiated based on past medical conditions or issues. These elements provide a comprehensive view of the child's medical background and ongoing health considerations.