The page shows only babies born in the United States, and excludes all inductions.
| Month | # samples | 2/3 Range | Average |
|---|---|---|---|
| January | 735 | 266-286 | 276 |
| February | 643 | 270-286 | 277.1 |
| March | 639 | 269-286 | 277.3 |
| April | 631 | 269-286 | 277.6 |
| May | 634 | 268-286 | 277.2 |
| June | 689 | 270-286 | 277.9 |
| July | 630 | 270-287 | 278.3 |
| August | 607 | 268-287 | 277.5 |
| September | 659 | 269-286 | 277.6 |
| October | 625 | 270-287 | 278.1 |
| November | 580 | 268-287 | 277.5 |
| December | 593 | 268-287 | 276.9 |