My son is 18 months. But yet to speak. All he can is " murm murm" asking for food and "mah mah" . Need to see speech therapist ?

It's alright. My gal only speaks at 3 yo, after she attented sch. before that not even mama. Let your son explore on his own, speak to him like how you would speak to any adult, he'll watch and learn from you.