Thank you for your query.
I appreciate your concerns as an elder brother and also marvel at your observations. By the description provided by you it is not possible to comment wether your sister is normal or autistic. We would like to know more about her:
1. Deatils of her developmental milestones.
2. Details of her physical growth.
3. Family and social history.
4. Birth history.
5. Any investigations done.
I suggest that you discuss with your parents and get your sister examined so that we can know more details about her and your concerns are addressed.
As regards your sister eating stones, chalky walls, we need to see if her nutrition is sufficient and she is not anaemic. The other reason for such a behaviour (pica
) can be handled by a care taker.
I hope I have answered your query to your satisfaction.
Wishing your sister all the best.
Rajiv K Khandelwal