فرضیه "پسر پرهزینه": چرا پسران بزرگتر ممکن است تولد را در بین گونه ها خطرناک تر کنند

The 'costly son' hypothesis: Why bigger sons may make births riskier across species

A new comparative review, published in The Anatomical Record, examines factors that may lead to birth complications among humans and other mammals. The study suggests that fetal sex may play an important role in risky births in humans and several other species.