Abstract
The orosomucoid content of serum has been determined in healthy infants and children. Analyses of haptoglobin and of electrophoretic protein fractions have also been made.
The mean umbilical cord serum level of orosomucoid was significantly lower than the level in the maternal serum. Apart from a transient increase during the first week of life, low serum levels were found up to the age of three months.
The alpha1, alpha2 and beta globulins showed essentially the same changes with age as the orosomucoid.
The serum content of haptoglobin was very low at birth and rose slowly to the level found in adults.