Mr. A has suddenly become very interested in counting. He can already count to 10, and we're working on the teens now. I recently came across the idea to number each stair from El hada de papel via Handmade Charlotte.
Since we walk up and down our stairs countless times per day, numbering them and counting them repeatedly really drives the lesson home in a fun, organic way. I downloaded the numbers here... but simply writing numbers on different colors of construction paper and cutting them out would do the trick too... I may have Miss O do this as a project over the Thanksgiving break so she can practice writing her numbers while helping her little bro learn to count.