  In the Majorana equation for particles with arbitrary spin, wave packets
occur due to not only the uncertainty that affects position and momentum but
also due to infinite components with decreasing mass that form the Majorana
spinor. In this paper, we prove that such components contribute to increase the
spreading of wave packets. Moreover, Zitterbewegung takes place in both the
time propagation of Dirac wave packets and in Majorana wave packets. However,
it shows a peculiar fine structure. Finally, group velocity always remains
subluminal and contributions due to infinite components decrease progressively
as spin increases.
