I purchased these blocks for my one year-old grandchild, whom I watch everyday during the week.  He LOVED them!  Actually, all of my grandkids from ages 1 through 8 had a blast playing with these blocks when they came over for Christmas. I ordered the 12-piece set of jumbo blocks to supplement the 40 piece basic set.  I highly recommend getting both sets so that your kids have enough pieces in all sizes.