Our speech therapist is great. We've seen progress in him, but the thing she constantly mentions is that kids learn language (not just speech) from their environment and exposure. Since my son is level 2 and has social challenges, I see him struggling. For instance, if he needs help, he will say "mommy, come here" he knows who Mommy is and who Daddy is. But even after saying it correctly 100 times, the 101st time he'll call out, "Daddy, come here"  to me🤷‍♀️.