Children start primary school aged between 4½ and 5½ depending on when the child's birthday falls. Scottish school policy places all those born between March of a given year and February of the following year in the same year group. Children born between March and August start school in August at between 5½ and 5 years old, and those born between September and February start school in the previous August at between age 4 years 11 months and 4½ years old. The Scottish system is the most flexible in the UK, however, as parents of children born between September and December can request a deferral for 1 year (not automatic, requires to be approved), whilst children born between January and February can opt to hold their child back a year and let them start school the following August. This usually allows those not ready for formal education to have an extra year at nursery school. (Funding is only available for children born in January and February).