| Value | Category | 
|---|---|
| 10 | Single birth/not a twin | 
| 20 | Twin or multiple | 
| 21 | 1st of multiple births | 
| 22 | 2nd of multiple births | 
| 23 | 3rd of multiple births | 
| 24 | 4th of multiple births | 
| 25 | 5th of multiple births | 
| 26 | 6th of multiple births | 
| var_concept.title | Vocabulary | 
|---|---|
| Child demography core Variables -- TOPICS | IPUMS |