
Children aged between six months and five years will start to be immunised against swine flu from this month.
GPs have been urged to speed up the vaccination programme
It follows an surge in the rate of infection in young children after schools returned from the summer break.
A report last month suggested that up to a third of youngsters in some areas may have had swine flu without showing symptoms.
GPs were last week urged to go "full throttle" to vaccinate as many vulnerable patients as possible.
More than one million people in the UK have been vaccinated a month after the programme began - one in 10 in the priority groups.
Overall the Health Protection Agency says swine flu has not been as bad as predicted for the autumn with the number of new cases about half of what they were in the summer.
Latest figures show the number of new cases of infection is falling or remaining steady across the UK.
In England last week, there were 46,000 cases, down from 53,000.
Scotland reported just over 21,000, about the same as the previous week.