Infant toys such as contrast cards and contrast books play an important role in the sensory development of the youngest children. Contrasting patterns and colors stimulate the developing eyesight of the child, helping him to better perceive the world around him. From the very first day of life, children can use these toys, which makes them an extremely important element of education and development. That is why it is worth taking a closer look at them and finding out what benefits they can bring to the youngest.