Child development therapy

Hello I’m originally from California and I have a 15 month old that is pretty behind in all areas of development. He does have pressure in his ears that’s affecting his hearing so tubes are being put in soon. Is there any therapy for physical,social, and Occupational Therapy programs available? My next question would be also if they are covered by the state or would I need to use my insurance for this? I’m only asking because in California his therapy was free until he’s 3 years old.