`` `` the higher risk of infant death to first order births is mainly due to the fact that such births occur predominantly to young women . the importance of the synergistic effect of maternal age and birth order is also demonstrated : for example , fifth order births to women aged 20-24 and third order births to women under 20 have a risk of about one infant death in every four live births . '' ''
C0011065
deat
C0549159
o