  The thermal description of light nuclei at the chemical freeze-out has been
investigated. First, I have verified the equilibration of the light nuclei and
then introduced a new method to investigate the light nuclei formation. One can
study the proximity between the phase space density of light nuclei ratios and
their hadronic constituents e.g $\bar{d}/d$ and $(\bar{p}\bar{n}/pn)$. I have
found that with the exclusion of the decay feed-down from the hadronic yields
in the thermal model, the hadronic representations have good agreement with the
light nuclei ratios. I have performed a similar analysis with the ratio of
$\Lambda$-hypernuclei and $^3 He$, which is related to the ratio $\Lambda/p$.
In this context, the strangeness population factor $S_3$ has been studied also.
These results indicate that the nuclei and hypernuclei formation may occur near
the standard chemical freeze-out and before the decay of the hadronic
resonances. This method will serve as a guideline to discuss the light nuclei
formation and the inclusion of decay into their hadronic constituents.
