Answer: 19 months.

Feb 2013 ⋅ ⋅ ⋅ #19

My 19-month old has started staring/pointing at numbers and letters with this expression

Oct 2012 ⋅

⋅ ⋅ #19

So my 19-month-old (who usually plays quietly in her room in the mornings) figured out how to open her

Nov 2012 ⋅

⋅ ⋅ #who-usually-plays-quietly-in-her-room-in-the-mornings #19