The page shows only babies born in the United States, and excludes all inductions.
| Month | # samples | 2/3 Range | Average |
|---|---|---|---|
| January | 713 | 266-286 | 276.1 |
| February | 625 | 270-286 | 277.1 |
| March | 621 | 269-286 | 277.4 |
| April | 618 | 269-286 | 277.5 |
| May | 615 | 268-286 | 277.3 |
| June | 670 | 270-286 | 277.9 |
| July | 610 | 270-287 | 278.4 |
| August | 586 | 268-286 | 277.5 |
| September | 641 | 268-286 | 277.6 |
| October | 607 | 269-287 | 278.2 |
| November | 563 | 268-287 | 277.6 |
| December | 577 | 268-286 | 276.9 |