I believe children learn best through play.
I try to incorporate lessons in their everyday play. Some examples are:
When they are playing with blocks I may ask what colors they are and/or count them, and when they play with the dolls/action figures I may ask if one is big or small and compare sizes.
Outside we learn about the weather. We love to explore around the neighborhood. The trees, leaves, and rocks.
We also do a lot of craft projects to help learn about the seasons and holidays throughout the year.