A Hong Kong doctor accused of a blunder that left a boy permanently disabled 16 years ago said he did not return to the hospital to examine the infant as he mistook the emergency for a choking case, the Medical Council heard on Sunday.

Testifying for the first time at the hearing, Dr Sit Sou-chi contested an allegation that he had failed to conduct all necessary and immediate investigations of newborn Li Yuanjian, the son of a mainland Chinese couple, after he had a seizure on December 22, 2009,...