Do the atoms that will make up newborn babies in the years 2030 exist right now?

Answer 1

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Yes. Especially the hydrogen atoms. Hydrogen atoms are nearly the same age as the universe.

Answer 2

Yes. One law of physics is that matter and energy can not be created or destroyed, only transformed. So the matter that made you came from your biological parents and when you die your matter will return to the Earth. 

Answer 3

They will probably be brought back in the resurrection so they will have new atoms.

Answer 4

Almost all of them do.

One of the oddballs would be carbon 14.  That's formed from nitrogen in the atmosphere being hit by cosmic rays.

Answer 5

Yes they do. Atoms get transferred from one kind of material to another. From soil to plants to vegetables to humans to offspring of humans, and so on. And eventually, when we die, back to the soil.

Answer 6

Yes, according to the Laws of Conservation and Thermodynamics.

Answer 7

Pretty much. Atoms are mostly only formed through fusion, fission, and radioactive decay. Maybe that baby will have a few atoms in them from various natural radioactive sources, or interactions with high energy sources like cosmic rays,  but 99.999% of the atoms on Earth are going to be older than the Earth.

Answer 8

Yes.

And every glass of water will likely contain some atoms from every person and historical figure that ever lived (and animals etc.)

Either as part of their body or part of what went, er. "through" them...

Answer 9

Almost positively yes. Chemical compounds and structures can be altered, but atoms are exceptionally stable basic building blocks of Everything and are very difficult to create or destroy.

Answer 10

Learn some chemistry.  I am making those atoms right now from my "make your own atoms" kit.