Does oxygen intake during pregnancy affect the fetus?

Patient's question:

I have been inhaling oxygen for half an hour every day for 7 months, and now the fetus is 8 months old.
What impact does this have on the fetus?
First follow-up question: The ultrasound results are good. Will frequent oxygen inhalation during pregnancy affect the fetus?
Second follow-up question: Can oxygen inhalation be continued throughout pregnancy?

Doctor's answer:

Hello, the reason why oxygen therapy is said to be harmful to the baby is because excessive oxygen intake can disrupt the acid-base balance of the blood, making it more alkaline, which is not beneficial for the baby's health.
Your daily oxygen therapy time is 40 to 60 minutes, and the duration is 7 days. This is unlikely to significantly alter the normal pH value of the blood, so there is no need to worry too much. Sufficient oxygen allows the baby to receive more nutrients, which is beneficial for their growth and development.
You are less than three weeks away from your due date, so it's important to pay special attention to changes in temperature and climate during this time. I hope my answer helps you!

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