  Recent measurements of charm-baryon production in proton--proton (pp)
collisions at midrapidity by the ALICE collaboration showed that
baryon-to-meson yield ratios are significantly higher than those measured in
$\rm e^+e^-$ collisions. The charm baryon-to-meson and charm baryon-to-baryon
yield ratios provide unique information on hadronization mechanisms since the
contributions from parton distribution function and parton--parton scattering
terms cancel in the ratios. In this contribution, the first measurement of $\rm
\Omega_{c}^{0}$ production via the hadronic decay channel $\rm \Omega_{c}^{0}
\rightarrow \Omega^{-}\pi^{+}$ (and its charge conjugate) in $2<p_{\rm T}<12$
GeV/$c$ performed with the ALICE detector at midrapidity in pp collisions at
$\sqrt{s}=$ 13 TeV is presented. The $\rm \Omega_c^0/D^0$ and $\rm
\Omega_c^0/\Xi_c^0$ ratios multiplied by the decay branching ratio $\rm
BR(\Omega_{c}^{0} \rightarrow \Omega^{-}\pi^+)$, which is not experimentally
measured, are compared to MC generators with fragmentation fractions based on
$\rm e^+e^-$ measurements and models including hadronization of charm quark via
coalescence.
