The aims of this study were to analyze temporal and spatial parameters of gait during pregnancy in women with and without PGP, to evaluate the effect of pelvic belts on temporal and spatial gait parameters, and to compare two types of belts. A total of 46 pregnant women with PGP, 58 healthy pregnant women and 23 non-pregnant women were recruited. Temporal and spatial parameters were analysed by an walkway. Two pelvic belts for pregnant women were used. An analysis of variance for repeated measures were used. In pregnant women with PGP, compared to healthy pregnant women, gait cycle and stance phase times were lower and single support time was higher. Compared to the non-pregnant women, gait velocity and step length were lower. Stance phase and double support times were higher. During pregnancy, wearing a pelvic belt modified gait velocity, single support phase, step length, step width, stance phase and toe in/out in pregnant women with PGP. Gait adaptations in pregnant women with PGP showed nearly the same changes found in women without PGP. The belts had an effect on gait in pregnant women with PGP, probably through a biomechanical and proprioceptive mechanism.