The page shows only babies born in the United States, and excludes all inductions.
| Month | # samples | 2/3 Range | Average |
|---|---|---|---|
| January | 719 | 266-286 | 276.1 |
| February | 633 | 270-286 | 277.1 |
| March | 629 | 269-286 | 277.4 |
| April | 622 | 269-286 | 277.6 |
| May | 622 | 268-286 | 277.3 |
| June | 679 | 270-286 | 277.8 |
| July | 621 | 270-287 | 278.4 |
| August | 593 | 268-287 | 277.4 |
| September | 646 | 269-286 | 277.6 |
| October | 612 | 269-287 | 278.2 |
| November | 570 | 268-287 | 277.4 |
| December | 746 | 270-285 | 276.4 |