Sanskar
Annaprashan
The first grain: a step from milk to the family plate.
When
Around the sixth month, alongside a doctor's advice.
The first bite is often kheer, payasam, or another auspicious dish of the house. North and south do not share one recipe. They share a meaning: the child now takes part in the family's food.
Paediatric advice also begins solid food around this age. The rite and the clinic are not rivals. Keep both.
This is a general introduction. Sequence, materials, and timing change with family, region, and shakha. Your priest and your own custom have the last word.