They are the same thing, just as someone with a slight sniffle and someone with a sinus infection can both have a cold, and there are lots of places in between.

They are the same thing, just as someone with a slight sniffle and someone with a sinus infection can both have a cold, and there are lots of places in between. We've also gotten a lot better at treatment: a significant fraction of children with large language delays end up living independently.