What is a significant risk for children under 4 years old regarding certain snacks?

For children under 4 years old, the significant risk associated with certain snacks is primarily a choking hazard. At this age, children's airway anatomy and swallowing skills are still developing, making them more vulnerable to choking on small, hard, or round foods. Snacks like whole grapes, popcorn, nuts, and certain hard candies can easily block their airways if they are not able to chew and swallow them properly.

While allergic reactions are relevant, especially considering the prevalence of food allergies, the immediate risk posed by choking is greater for this age group. Similarly, high sugar content and excessive salt intake are concerns for overall health, but they do not present the same immediate danger that choking does. Thus, the focus on choking hazards is particularly important when selecting snacks for young children to ensure their safety during eating.