2018,Vital statistics of Japan,, Volume 1 Natality,Table 4.16 Live births and percent distribution by birth order and age of mother:JapanC 2018 ,Number,,,,Percentage,,, ,Total,1st,2nd,3rd,Total,1st,2nd,3rd Total,918399,425233,337705,120401,100.0,100.0,100.0,100.0 @`19 Years,8778,7777,946,52,1.0,1.8,0.3,0.0 20`24,77023,51638,20812,3985,8.4,12.1,6.2,3.3 25`29,233754,138103,71690,19462,25.5,32.5,21.2,16.2 30`34,334906,137990,135763,48529,36.5,32.5,40.2,40.3 35`39,211021,70400,87698,39800,23.0,16.6,26.0,33.1 40`44,51258,18566,20286,8338,5.6,4.4,6.0,6.9 45`,1659,759,510,235,0.2,0.2,0.2,0.2