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 Does the Helix Kids Mattress need a foundation? What if my child is big for their age? Will the Helix Kids Mattress work on bunk beds? Why is the Helix Kids Mattress the right choice for my child? Is the Helix Kids Mattress organic?