Abstract
This report describes a new method for giving repetitive intraperitoneal injections to neonatal rats. The hypodermic needle is passed through the muscle layer of the flank directly into the peritoneal cavity in contrast to the conventional approach. In a trial using 20 neonatal rats aged 1 day, no leakage of the inoculated physiological saline occurred, and there was no associated morbidity or mortality of these rats.