Nuclei of atoms that make up a newborn baby were made in:
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In the mother's body
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Ancient stars
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The food the mother eats before giving birth
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The earth
According to astrophysics and nucleosynthesis theory, almost all elements heavier than hydrogen and helium were formed in the interiors of stars through nuclear fusion. The atoms that make up a newborn baby's body were created in ancient stars that exploded billions of years ago, scattering these elements across the universe before our solar system formed. This is not about the mother's body, food, or earth.
Elements heavier than hydrogen and helium — including the carbon, oxygen, calcium, and iron in a baby's body — are forged through nuclear fusion inside stars and scattered into space when those stars die, often in supernova explosions. This 'stellar nucleosynthesis' means the atomic nuclei that build up living things predate the Earth and solar system itself, rather than being created by the mother's body or diet.