They basically develop their own signing system to get their communication across. Again, the underlying problem is the motor timing, and there are various reasons for that. The diagnosis for children is best made after the child is five, because of the point I spoke about before, which was children's developing control over their speech motor systems. In adults, it's often called AOS, or apraxia of speech. It's somewhat controversial.
Some children are just a little slower than others at getting mastery of speech production.
I think it's important not to frighten parents with a diagnosis of DAS that may not be necessary. On the other side of that, we have to believe what parents hear and see. The big thing with children who are little, babies and toddlers even, is that we facilitate their communication in whatever way they are communicating. With adults, yes. It's often easier or straightforward to get reimbursement with a speech disorder that is of a neurological documentable basis.