Hyperbaric Oxygen Therapy (HBOT) involves breathing pure or enriched oxygen in a pressurized chamber, typically at pressures of 1.3–1.5 atmospheres absolute (ATA), for sessions lasting about 40–60 minutes. 

The proposed mechanisms include:

• Increasing oxygen delivery to brain tissues, potentially improving cerebral metabolism and function in under-oxygenated areas.

• Reducing inflammation in the brain and gut.

• Promoting stem cell mobilization and anti-inflammatory effects.

• Enhancing overall neurological function, which could support better social, communication, and behavioral outcomes.

Reported potential benefits in some studies and parent reports include improvements in:

• Social interaction and eye contact.

• Communication skills (e.g., receptive language, speech).

• Behavior (reduced irritability, hyperactivity, stereotypy, or repetitive behaviors).

• Cognitive awareness and sensory processing.

• Overall functioning, motivation, and daily adaptive skills.

HBOT is generally considered safe and well-tolerated in children when administered properly, but it is not a mainstream or FDA-approved treatment for autism. It should only be considered under medical supervision, ideally as part of a broader, evidence-based plan (e.g., behavioral therapies). Parents interested in it should consult specialists and weigh the current scientific debate carefully