From: Changes in fetal and neonatal mortality during 40 years by offspring sex: a national registry-based study in Norway
Up to birth
After birth
Total
23-28 weeks
29-36 weeks
≥ 37 weeks
≤ 1 week
1 week - 1 month
Boys
386
1,767
1,956
4,767
425
9,301
Girls
269
1,556
1,679
3,187
302
6,993
Difference
117
211
277
1,580
123
2,308