A] That chin strap is clearly a choking hazard.
B] The ladybug stamp is not made from an American Pediatrics Association approved ink.
C] A two year old with a bottle? Are you trying to ruin her for LIFE? TAKE THAT OUT OF HER HANDS RIGHT NOW YOU HORRIBLE, HORRIBLE, MOTHER.
or D] Plastics kill.
Ha! It was a trick question! There are NO parenting mistakes in this picture*, because this child has PERFECT PARENTS.
*unless you count the fact that to the right of the photographer, the TV is tuned to Spongebob Squarepants.