Sperm, egg, fetuses, and toddlers are all human in the adjective sense of the word, since they possess human DNA. Unlike sperm and egg, however, fetuses and toddlers are also human in the noun sense of the word. A fetus is a human and a toddler is a human, while an individual sperm cell or egg cell is not a human. This is similar to how we might say apple pie and the president are both American, while the president of the United States is an American, and the apple pie is not. If a cell of a male gynecologist’s skin, which has a complete set of human DNA, winds up inside a woman’s uterus as
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