Give your child a sensory rich experience. Try:
- finger paints
- fidgets - little toys they can fidget with that have a variety of textures and sensory stimuli
- silly putty
These things may be too much for a child who has not had any stimulus, but introducing one thing and showing the child that it's okay can be a growing, trusting experience for your little one.
Even snacks can be sensory rich. Did you know that sweet=calm and sour=alert? That explains why my little tornado LOVES sugar. It helps her calm down. Now I have scientific proof of what I naturally suspected.
Blessings to you,