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Answer for all those people who feels blood sample is not the correct path. Here is the answer.
Babies inherit half of their DNA from their mother and half from their father. Companies can therefore analyse the mother's blood sample, which contains both her and her baby's DNA, alongside the father's sample, which contains only his DNA. By looking at these specific sites in the DNA, analysts can determine which DNA molecules come from the baby and not the mother. They can then cross-check to see if it matches the DNAmarkers in the alleged' father's DNA.
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