I can understand your concern.
Nothing special. Just keep the baby in a airconditioned room. Its advisable that you also stay with the baby.
Also, it would be better if you people do not burst any crackers. Because many people have breathing difficulties and the smoke adds to it.
Dr. Anil kumar jain.
Dear friend, Since smoke travels upwards keep the baby in the ground floor of the house. Keep the child in an air conditioned closed room if possible. If air condition is not available keep the child in a room with Windows on opposite walls and keep a fan facing one of the windows as it can act as an exhaust system. Choose an environment with lots of trees if possible.To dampen the sound there are sound dampeners available. U can use an overhead headphone as an alternative. Don't worry about anything. The baby will be safe inspite of the diwali noise. Hope this helps. Regards