The red and white "Age Warning" logo that consists of an unhappy child's face alongside the numbers "0-3", first appeared on toys in 1995 and means that the toy is unsuitable for children that are younger than three years old. Sometimes, you may find the logo referred to as the "grumpy baby" symbol!
Before the Age Warning logo was introduced, the written warning "not suitable for children under 3 years" was used on toys, although this was sometimes confused with purchasing advice (i.e. rather than being a strict warning that the toy represents a hazard to babies and toddlers).
Either beside the Age Warning symbol or within the toys packaging will be further information describing the risk in more detail. For example, the toy may contain small parts that represent a choking hazard.