# Birth date of child 3 derivation

Indicates whether the birthdate of the third child in a household was directly sourced or inferred from other household attributes.

- API name: `birth_date_of_child_3_derivation`
- Category: Demography
- Type · unit: Text
- Individuals with a value: 8.3M (3.2%)
- Latest collection: Jun 1, 2026, refreshed every two months
- How values combine: Read from a single source field.

## Links

- [Catalog page](/catalog/v2/birth_date_of_child_3_derivation)
- [Published statistics (JSON)](https://static.faraday.ai/figv2/birth_date_of_child_3_derivation.json)
- [API reference](/docs/reference/getattribute)