Tokyo, Oct 26 : Japan began Covid-19 vaccination for children aged between six months and four years on Tuesday at a hospital in Tokyo. Japan's health ministry started to distribute the vaccines to municipalities on Monday. Inoculations are set to follow in other places of the country when the local governments are ready, Xinhua news agency reported. The vaccines targeting the original strain will be administered over three shots for the young children, each containing one-tenth of the dose given to adults. The first two shots must be administered three weeks apart, while a third dose will be given at least eight weeks after the second inoculation. The health ministry approved the Pfizer vaccine earlier in October, making it the first Covid-19 vaccine available in Japan for that age group. The move expanded the eligibility criteria for Covid-19 vaccination to almost all age groups. In February, Japan expanded the vaccination programme to include children aged 5 to 11. /IANS