I couldn't possibly confirm confirm that your child is severely disabled.
I would need to refer your LA to a HV, who will refer on to a Paed, who will refer on to CAMHS, who will refer on to a SALT, who will refer to an OT, who will refer on to a multi-dsciplinary diagnostic team, who will then refer you and your LA back to me (in approximately two and a half years time) and only then will I be in a position to tell you what I think. Which will probably be what you have just said.