Humming can be a form of self-stimulation (or "stimming") often seen in children and adults on the autism spectrum. It may help regulate sensory input, reduce anxiety, or express emotion. But not all humming means autism. Learn how to understand the context, when to observe more signs, and how to support your child if you're noticing repetitive sounds or behaviors. https://rachnaautismcare.com/understanding-and-managing-humming-in-autistic-children