Hong Kong has reduced the minimum age for getting vaccinated with China's Sinovac COVID-19 shot to six months from three years after several young children became infected with the virus.
Adults and children in the Asian financial hub, which retains some of the world's toughest COVID-19 precautions, are required to have at least three vaccine shots.
"Recently a series of young children have been infected with the new coronavirus," the government said in a statement announcing the reduction in age.
"The situation of severe illness and even death is of great concern."
The government said it was also negotiating with China's Fosun, which supplies Germany's BioNtech vaccine, to purchase a formula of that vaccine for children.
The minimum age to get a shot of the BioNtech vaccine is currently five.
About 90 per cent of Hong Kong's more than seven million people have had two doses of a coronavirus vaccine, and about 67 per cent have had three.
Residents can choose between BioNtech and China's Sinovac.
A government advisory panel on Monday recommended a fourth vaccine dose be given to those over 50.
The Chinese-ruled city has reported more than 1.3 million COVID-19 cases and 9500 deaths since the pandemic started, most of which occurred this February and March due to the fast-spreading Omicron variant.