The Normal Child And Some Of His Abnormalities, by C.W. Valentine.
Sample quote:
…I may mention that in one American investigation among over 300 children of ‘pre-school age’, about whom the mothers did not think they needed any psychological help or advice, it was found that over 90 per cent presented one or more of the following symptoms: temper tantrums, food refusal, enuresis, lack of bowel control, breath-holding or mouthing, finger-sucking, manipulation of genitals, vomiting. Temper tantrums were found in about half. The normality of such behaviour…
Penguin Books, 1956/7.