What type of toys are not suitable for children under four years of age?

Small toys are not suitable for children under four years of age primarily due to the risk of choking. Children in this age group often explore their environment by putting objects in their mouths, and small items can easily become lodged in their throats. Items that are small enough to be swallowed pose a significant hazard, as they can lead to life-threatening situations.

In contrast, the other types of toys mentioned—soft toys, musical toys, and building blocks—are generally designed with safety in mind for younger children. Soft toys are typically safe because they pose a minimal choking hazard and are made from non-toxic materials. Musical toys are engaging and often designed to be large enough to avoid choking risks, while building blocks can be made large enough for safe manipulation, allowing for developmentally appropriate play without posing a hazard. Therefore, avoiding small toys is crucial to ensuring the safety and well-being of children under four.