Geez, If I didn't know better, I'd say we have the same kid! same age and everything. We call him baby "T" at home, because of his baby Pterodactyl scream. It is as if that was how he learned to communicate. This kid too had no language, not understood or spoken. I wondered if he could hear, and immediately started on sign language. He knows the basics now: Milk, water, cookie
so he can let me know some basic needs.
The issue for me, in a short term placement is MY bonding with this child. I sometimes lift him out of the crib after he has fallen asleep and rock him, stroking and humming. He wakes up, but is tired enough to just snuggle in. I feel better about him, and can be more loving and nurturing even during his temper and screaming. It has helped, and he now comes to me, and is actually sometimes clingy.