I think the answer is oxygen, but not 100% sure
Answer:
From your parents DNA i believe
Explanation:
The temperature of the earth
Answer: Macrosomia
Macrosomia is a medical term used to describe a newborn that has excessive birth weight. Babies born with more than 4000-4500 g (8 lb 13 oz -9 lb 15 oz) are classified as having macrosomia.
Some facts that can influence birth weight: genes, sex, race, and ethnicity.