The aim of this work is twofold: on one hand, we intend to contribute to description of the breathing patterns on children’s speech and, on the other hand, to observe the different factors of variability that affect its organization. Fifteen speakers, from 8 to 11 years old, were recorded during a reading task and a spontaneous speech task. We were able to measure variability of the thorax and abdominal perimeters with respiratory electromagnetic belts. The data were synchronized with the acoustic signal. If the amplitude of inspiratory movements does not seem to be affected by neither the speaking task nor its position during speech, the duration of the movement is sensitive to the speech task and, to a lesser extent, to its syntactic localization. Part of the high inter- and intra-individual variability observed results from the different strategies used by the speakers in distribution of the breath groups.