For a long time, he only played with the hands of the clock on this board, pointing out the numbers from 1-12. Then one day he took notice of the date numbers. More quickly than I expected, and without any help from anyone, he put the numbers 1-31 in order and looked for more. The iPad has an app that counts until 50, so clearly he's been paying attention to this. There is also a poster on his wall with numbers up to 100, and he's been pointing to these one by one and asking us to count for him.
So - reading, check! Counting, check! Next comes simple Maths. My Waterloo. I do hope I'm up to this.