What is the weight limit for the Helix Kids Mattress? November 02, 2021 19:36 The Helix Kids Mattress is designed with durable steel coils to provide long-lasting support for weights up to 500 pounds. Related articles What if my child is big for their age? Does the Helix Kids Mattress need a foundation? Do I need a mattress protector with the Helix Kids Mattress? What sizes are offered in the Helix Kids Mattress? Why is the Helix Kids Mattress the right choice for my child?