warning : graphic content .
justin whittington , 23 , was taken into custody in california on friday .
initially charged with child cruelty , it was dropped to ` endangerment '
on saturday , after his bail went from $ 1m to $ 20,000 , he posted bond .
whittington was ` filmed hitting a toddler in the face so hard that he falls '
he took to facebook on sunday asking for a ` second chance '
asked for his son and wife to be ` left out of this ' as he is ` made to suffer '