I was surprised at how much help B needed at first to get the clothes pins to work. Pretty soon the felt squares were on the floor and B was just putting the clothes pins on the string. He focused on that for a LONG time!
Then we tried to pin up the names of our family. This was a hit and reinforced the order of the letters in our names.
Overall, this was a great activity for developing motor skills and has so much potential for working with letters, numbers, or even colors. For now, B is just happy pinning them on the line and calling out the letter or number on the clothes pin he is using.