Now that Mr. S. (just about) has his days of the week down pat, we've started trying to teach him the months of the year (they are doing this at his preschool too).
The preschool years are a good time to start teaching this important concept because not only is your little one starting to realize that there are differences to the the months (and more likely, the seasons), but it is an important "life lesson" that he'll need as he gets older.
Check out our tips on teaching the months of the year (break out the calendar!) -- has your preschooler shown any interest in this topic? How did you teach them to your child?