We have determined the correlation between IgE in cord blood and capillary scrum from 98 mature children at 5 days of age, Sixty‐six per cent had no family history of atopy., 29% had a single and 5% a double disposition. The study showed a good correlation, rho = 0. 75, p < 10⁻⁵, between IgE levels in cord blood and capillary blood samples drawn on the 5th day of life in children both with and without a heredity of atopic diseases. There was no correlation between the concentrations of cord blood IgE and IgA.