While definitive research on which gender starts moving earlier isn't readily available, studies suggest a difference in movement frequency and intensity later in pregnancy.
Fetal Movement: Boys vs. Girls
One study, published in 2001 in the journal Human Fetal and Neonatal Movement Patterns, observed that boys may exhibit more frequent leg movements in the womb than girls. This difference was noted at 20, 34, and 37 weeks gestation. However, this study doesn't address the initiation of movement, only the amount of movement at specific gestational ages. The study implies that both sexes begin moving, but boys may be more active. Further research is needed to determine definitively if there's a gender-based difference in the onset of fetal movement.
Therefore, we cannot definitively answer which gender starts moving earlier based on the provided information. More research is needed to address this specific question.