Short answers, pulled from the story.
The average birth weight of a full-term newborn in developed countries is approximately 3.5 kilograms. This figure can vary significantly based on gestational age and maternal health conditions.
The anterior fontanel remains open to accommodate the rapid growth of the brain during the first year of life. The skull bones eventually fuse together in a natural process that may take years to complete.
Asiana Airlines allows babies to board international flights at 7 days of age. Other carriers have different restrictions, such as Garuda Indonesia which disallows all babies under the age of 14 days.
Non-Hispanic black women have an infant mortality rate of 13.63 per 1,000 live births in the U.S. This rate is significantly higher than the 5.76 per 1,000 live births recorded for non-Hispanic white women.
These gaps known as fontanels allow the skull to compress during labor to enable the infant to pass through the birth canal. They also remain open to accommodate the rapid growth of the brain during the first year of life.