The aim of this study was to determine the effect of relative age on certain anthropometric characteristics, motor skills and tests for the evaluation of ball technique in children of football players born in different quarters of the year. The study was conducted on a sample of 204 subjects in the U9 and U11 age categories. The obtained results indicate that there is a statistically significant difference between the respondents born in the first quarter and those born in the other quarters in one anthropometric variable, namely body height (ATV). Also in the variables of motor skills in only one there is a statistically significant difference between the respondents born in the first quarter and the other respondents, which is in the variable throwing medicine (MBM). There were no statistically significant differences in the variables used to evaluate the ball technique among the observed groups of subjects. The results of the distribution of respondents broken down by quarters indicate a slightly higher representation of players born in the first quarter (27.94%) than in other quarters. It can be said that the results obtained in this study indicate the existence of a relative age effect, and that in certain variables of morphological characteristics and motor abilities there is a statistically significant difference between the subjects.