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About 3 months, usually respiratory system of the baby develops at 12 weeks of age.

** The fetus's heart starts beating at five weeks gestation.

Through an ultrasound you can see the ultrasound at about 6-7 weeks.

With a fetal Doppler you can hear the heart beat at about 9 weeks.

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Q: How soon can an ultrasound hear a baby heart beat?
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