Black and white toys and visual stimuli are often recommended for babies, especially in the first few months of life. Although babies are not yet able to distinguish all colors at birth, they are sensitive to contrasts, especially the strong contrast between black and white. A few reasons why black and white visual stimuli can be beneficial for babies:

1. Visual Stimulation: The strong contrasts of black and white attract babies' attention. They help stimulate visual perception and develop eye muscles. Babies can better distinguish and follow the contrasting patterns with their eyes.

2. Focusing and tracking: Looking at black and white patterns can help babies practice their focusing and tracking skills. Their visual tracking skills are stimulated by following the contrasting lines and shapes.

3. Calming effect: Black and white patterns and images can have a calming effect on babies. They provide a visual simplicity that can help babies relax and feel safe.

4. Strengthen Cognitive Development: Exposure to black and white patterns and images can help babies boost their cognitive development. They learn to distinguish shapes and lines and begin to understand the basics of pattern recognition.

Black and white toys, books and mobiles are specially designed for babies' first months. They contain simple black and white patterns, contrasting images and different textures to enrich the sensory experience. However, it is important to keep in mind that as babies grow older, they will appreciate colorful stimuli and toys with more variety and detail as their visual skills continue to develop.