Duration in years of interval between births Order of birth Total Total All orders 340,571 Total First 171,256 Total Second 134,051 Total Third 27,621 Total Fourth 5,207 Total Fifth 1,373 Total Sixth 551 Total Seventh 271 Total Eighth 124 Total Ninth 60 Total Tenth and over 57 0 years All orders 24,025 0 years First 22,763 0 years Second 1,025 0 years Third 181 0 years Fourth 31 0 years Fifth 12 0 years Sixth 5 0 years Seventh 3 0 years Eighth 4 0 years Ninth 1 0 years Tenth and over .. 1 year All orders 60,145 1 year First 38,770 1 year Second 16,131 1 year Third 3,867 1 year Fourth 862 1 year Fifth 249 1 year Sixth 111 1 year Seventh 75 1 year Eighth 39 1 year Ninth 21 1 year Tenth and over 20 2 years All orders 67,984 2 years First 35,355 2 years Second 26,536 2 years Third 4,620 2 years Fourth 955 2 years Fifth 269 2 years Sixth 120 2 years Seventh 62 2 years Eighth 35 2 years Ninth 21 2 years Tenth and over 11 3 years All orders 57,144 3 years First 26,252 3 years Second 25,689 3 years Third 4,095 3 years Fourth 746 3 years Fifth 204 3 years Sixth 72 3 years Seventh 49 3 years Eighth 15 3 years Ninth 5 3 years Tenth and over 17 4 years All orders 41,807 4 years First 16,992 4 years Second 20,574 4 years Third 3,428 4 years Fourth 560 4 years Fifth 143 4 years Sixth 71 4 years Seventh 20 4 years Eighth 9 4 years Ninth 7 4 years Tenth and over 3 5 years All orders 27,556 5 years First 10,359 5 years Second 13,962 5 years Third 2,585 5 years Fourth 460 5 years Fifth 114 5 years Sixth 48 5 years Seventh 18 5 years Eighth 7 5 years Ninth 1 5 years Tenth and over 2 6 years All orders 18,330 6 years First 6,512 6 years Second 9,274 6 years Third 2,055 6 years Fourth 352 6 years Fifth 78 6 years Sixth 35 6 years Seventh 15 6 years Eighth 7 6 years Ninth 2 6 years Tenth and over .. 7 years All orders 12,549 7 years First 4,189 7 years Second 6,326 7 years Third 1,641 7 years Fourth 284 7 years Fifth 77 7 years Sixth 18 7 years Seventh 10 7 years Eighth 2 7 years Ninth 1 7 years Tenth and over 1 8 years All orders 8,391 8 years First 2,922 8 years Second 3,983 8 years Third 1,180 8 years Fourth 221 8 years Fifth 50 8 years Sixth 21 8 years Seventh 9 8 years Eighth 4 8 years Ninth .. 8 years Tenth and over 1 9 years All orders 6,009 9 years First 2,017 9 years Second 2,783 9 years Third 975 9 years Fourth 173 9 years Fifth 45 9 years Sixth 13 9 years Seventh 2 9 years Eighth .. 9 years Ninth .. 9 years Tenth and over 1 10 years All orders 4,443 10 years First 1,398 10 years Second 2,111 10 years Third 762 10 years Fourth 122 10 years Fifth 31 10 years Sixth 15 10 years Seventh 1 10 years Eighth 1 10 years Ninth 1 10 years Tenth and over 1 11 years All orders 3,465 11 years First 1,044 11 years Second 1,663 11 years Third 607 11 years Fourth 107 11 years Fifth 37 11 years Sixth 6 11 years Seventh 1 11 years Eighth .. 11 years Ninth .. 11 years Tenth and over .. 12 years and over All orders 8,723 12 years and over First 2,683 12 years and over Second 3,994 12 years and over Third 1,625 12 years and over Fourth 334 12 years and over Fifth 64 12 years and over Sixth 16 12 years and over Seventh 6 12 years and over Eighth 1 12 years and over Ninth .. 12 years and over Tenth and over ..