Summary In an epidemiological study of the behaviour of a 1 in 4 sample of 3‐year‐old children living in a North London Borough, it was found that 7 per cent had a behaviour problem winch was moderate or severe. A further 15 per cent had mild behaviour problems. There were no significant social class differences. Boys were significantly more likely to be overactive, to be wetting at night and during the day, to be soiling and to have relapsed in sphincter control after a period of being clean or dry. Girls were more likely to be fearful: there were no other sex differences in the frequency of problem behaviour.
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