The maximum weight capacity for a kids' kitchen step stool will vary depending on the specific product. It's important to check the weight limit before purchasing a step stool to ensure it is safe for your child to use.
In general, most kids' kitchen step stools are designed to support up to around 10-30 kg. However, some stools may have a higher or lower weight capacity, so it's always a good idea to check the manufacturer's specifications.
It's also worth noting that even if a step stool has a high weight capacity, it may not be suitable for very young children or those who are not yet able to safely use a step stool. In these cases, it may be better to wait until the child is older or more coordinated before using a step stool.