Rowan Blanchard was 7 in The Back-Up Plan when she played the character 'Mona's Kid (7 yrs)'.
That was over 14 years ago in 2010.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 22, and has starred in 9 movies in total, 8 of those since The Back-Up Plan was released.
In The Back-Up Plan, I think Rowan Blanchard looks: