| Name | Label | Year | Form | Question Number | Library |
|---|---|---|---|---|---|
| bre | Breast feeding | 1948 | Derived 1948 AN1 | 16 | Y27 |
| sit | Age of sitting up alone (months) | 1948 | 1948 AN1 | 6a | Y28 |
| sta | Age of standing alone (months) | 1948 | 1948 AN1 | 6b | Y28 |
| tal | Age of talking. 01-24 actual age coded (months) | 1948 | 1948 AN1 | 6e | Y28 |
| too | Age of cutting first tooth (months) | 1948 | 1948 AN1 | 6d | Y28 |
| wal | Age of walking several steps without support | 1948 | 1948 AN1 | 6c | Y28 |