  In this paper, we estimate the magnetic Reynolds number of a typical
protostar before and after deuterium burning, and claim for the existence of
dynamo process in both the phases, because the magnetic Reynolds number of the
protostar far exceeds the critical magnetic Reynolds number for dynamo action.
Using the equipartition of kinetic and magnetic energies, we estimate the
steady-state magnetic field of the protostar to be of the order of kilo-gauss,
which is in good agreement with observations.
