We have many puzzles at HEGURU as well, but start with what the child shows interest in. In the beginning, let him take as much time as he wants and let him complete it. The importance lies in completion and having him experience success. Once the child gets accustomed to this, you can start timing him. During the toddler stage, work together, handing him the pieces, perhaps saying the names of the shapes along. This will build his interest and recognition of different shapes.