Children who commit suicide tend to do so when they're due to go back to school after a long vacation, according to a government study, prompting officials to urge that extra attention be paid to youngsters before the end of summer holidays.

The study by the Cabinet Office covered 18,048 suicides by children aged 18 and under from 1972 to 2013. Officials said Tuesday that the number of youngsters who killed themselves on Sept. 1 was significant, at 131. Many schools reopen on that day after summer vacation.

The date for the second-most number of child suicides is April 11, with 99. This was followed by April 8 at 95, Sept. 2 at 94 and Aug. 31 at 92.