This study aims to evaluate the effect of the relaxation intervention on the immune system of mothers with low birth weight babies. 60 puerperal women (control and experimental groups) with babies weighing less than 2,500g and attending the Obstetrics Department of a public hospital in Esp rito Santo, Brazil, were assessed. Salivary immunoglobulin A (IgA) was used as an immunological parameter. The aim was to examine the correlation between the salivary...