For a baby or very young child:
* చిన్నవాడు/చిన్నది ఏమి చేస్తోంది? (Chinnavaadu/Chinnadi emi chestundi?) - This literally translates to "What is the little boy/girl doing?"
* బిడ్డ ఏమి చేస్తోంది? (Bidda emi chestundi?) - This means "What is the child doing?"
For a slightly older child:
* చిన్నారి ఏమి చేస్తోంది? (Chinnaari emi chestundi?) - This means "What is the little one doing?"
* పిల్లవాడు/పిల్లది ఏమి చేస్తోంది? (Pilluvaadu/Pilladi emi chestundi?) - This means "What is the boy/girl doing?"
You can also use the word పని (pani) which means "work" to ask about what the child is doing, for example:
* చిన్నవాడు ఏమి పని చేస్తోంది? (Chinnavaadu emi pani chestundi?) - "What work is the little one doing?"
The best option will depend on the specific context and the age of the child.