No, babies are not born with fully erupted adult teeth, but they do have the beginnings of both baby teeth (deciduous teeth) and adult teeth developing in their jaws at birth.
Here's a more detailed explanation:
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Deciduous Teeth Development: The development of these "baby teeth" actually begins very early, around 5 weeks of gestation while the baby is in the womb.
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Deciduous Teeth Present at Birth: At birth, a baby has all 20 of their deciduous teeth – 10 in the upper jaw and 10 in the lower jaw – already formed within their gums.
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Adult Teeth Development: Alongside the deciduous teeth, the baby's permanent (adult) teeth are also developing in the jaws at the time of birth. These adult teeth will eventually replace the baby teeth as the child grows.
Therefore, while babies aren't born with visible adult teeth, the initial stages of their development are already underway before they are born.
