It would be best if you chose the depth of sand in the sandbox depending on the age of your child. Here's how to do it! Age Recommended depth Infant, 1-2 years old 2.5 in (6.4 cm) Toddler, 2-3 years old 3 in (7.6 cm) Preschooler, 3-5 years old 5 in (12.7 cm) Gradeschooler, 5-12 years old 9 in (22.9 cm) Remember to consider your own kid's preferences! Read more