People with disabilities who are entitled to the free or discounted "Io viaggio ovunque in Lombardia" pass can circulate for free on the ATM network in Milano and neighbourhood. One condition to request "Io viaggio ovunque in Lombardia" pass is to have been resident in Lombardy for at least 5 years.

How to apply for this pass here (only in Italian language)

Regardless of the kind of disability and place of residence, minors under 14 can travel on all public transport in Milano, provided they are accompanied by an adult family member who has a valid ticket for the itinerary chosen and who has filled in the following self-certification form: https://www.atm.it/it/ViaggiaConNoi/_layouts/atm/apps/Default.aspx (only in Italian language)