What are the biggest challenge in blood drawing that children present?

One of the biggest challenges in blood drawing from children is their anxiety and fear of needles, which can lead to movement and difficulty in obtaining a sample. Additionally, children's smaller veins are often harder to locate and may collapse more easily, making the procedure technically challenging. Their limited ability to understand the importance of the procedure can also hinder cooperation, resulting in a need for skilled techniques and strategies to ensure a successful blood draw.