<prompt> What is the most likely diagnosis for this boy who was born at 36 weeks gestation weighing 1800 g?Congenital parvovirus B19 infectionFetal alcohol syndromeNeonatal thyrotoxicosisNesidioblastosis  <response>: Answer C. Neonatal thyrotoxicosisThe upper eyelids are retracted and subcutaneous fat is virtually absent, findings that are most consistent with a diagnosis of neonatal thyrotoxicosis. Mother and child recovered with treatment. 