Final answer:
Physiologic drop in H&H is a normal decrease in red blood cells and Hemoglobin; Transient Erythroblastopenia is a temporary suppression of red blood cell production after a viral infection.
Step-by-step explanation:
Physiologic drop in Hemoglobin (H&H) is a normal decrease in the levels of red blood cells and their corresponding Hemoglobin content. This can occur naturally at around 2-3 months of age.
Transient Erythroblastopenia is a condition seen in children between the ages of 3 months to 6 years, where there is a temporary suppression of red blood cell production due to immune response after a viral infection, but not the B19 virus.