When our middle son was approaching two, he was barely speaking. He just didn’t. Because he was already under weight and under tall, he was referred to a paediatrician, then to a speech therapist.
The therapist did one simple thing for us, though admittedly, he had started to speak more by this time. She suggested we do more imagination play with him. Pretend we were eating, pretend we were going to school or gramma’s house. Pretend we were dogs, pretend we were painters, whatever. This would cause him to have to search for and then use words to describe what he was doing. Up to this point we had given him stuff to do, apparently he just wanted to play.
This really seemed to open up his linguistic world. You should hear the things he comes up with now, and he reads like a wonder. He’s still under tall and under weight, but he no longer is under speaking! And we couldn’t be more pleased.
All that to say, if you have a one or two year old at home, try imagination play to expose them to opportunities to use their spoken language.