I know that in the US, recommending TDAP for each pregnancy is a relatively recent change (2013). The recommendation for all other adults is one single booster in adulthood. The 10 year recommendation is for the Td vaccine just for tetanus. If someone has needed shots for tetanus in the past, it's possible that they got TDAP or just the Td - most likely they would have gotten one TDAP and then just Td subsequently, but that would be worth checking for someone that will be in close contact with the baby.
TDAP booster is recommended for all adults regardless of contact with infants so that might be good to bring up with people that are reluctant about it for whatever reason, to remind them that it is not strictly for the benefit of your baby but that it will be good for them to have anyway.
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