We studied the auxological effects of treatment with the GnRH agonist leuprolide acetate (Lucrin<sup>®</sup>) at 3.75 mg/ 28 days in 38 children with early or precocious puberty. We present our newly developed scoring system, the Puberty Suppression Score (PSS), in which clinical and biochemical parameters determine whether suppression was effective. Leuprolide acetate suppressed pubertal development in the majority of cases. During treatment there was a significant correlation between the number of times that PSS was >0 and gain in predicted adult height (PAH) compared to initial prediction at the start of treatment. After 6 months of treatment, ineffective suppression measured by PSS was associated with the magnitude of gain in PAH. We conclude that a leuprolide acetate dosage of 3.75 mg every 28 days effectively suppresses puberty. PSS is helpful in monitoring the suppressive capacity of a GnRH agonist. We recommend to start with leuprolide acetate at 3.75 mg/28 days and to increase the injection frequency or dose in case PSS is >0 after 6 months of treatment.