When are natal/neonatal teeth typically present?

By definition, natal teeth are present at birth, and neonatal teeth erupt within the first 30 days of life (commonly cited as within about the first 10 days to a month) — well before the typical eruption of the first primary teeth around 6 months of age. Among the given options, 10 days best reflects the neonatal teeth timeframe (versus the much later 6-9 month range, which describes normal primary tooth eruption).