Need during a third-trimester ultrasound, what would a doctor expect to observe in a fetus? initial development of organs response to noise and light presence of a tail-like structure the first heartbeat

The right answer is response to noise and light

Hearing is one of the first senses that develops in the fetus and if its organs are not yet all formed, the baby is able to perceive the sounds that surround it from the third trimester of pregnancy. Indeed, its auditory system is mature from the 30th week of pregnancy, ie between the 7th month and the 8th month of pregnancy. But he is also more fragile.

The fetus also perceives light at the end of pregnancy. For up to 20 weeks, the eyelids of the fetus remain closed. Then, he perceives a very dim light: in utero, it is not more intense than that of a street lit at night. The abdominal wall acts as a filter.

What your baby perceives is mostly variations. If you go from a dark room to a sunny terrace, for example, it will perceive a red light of an intensity comparable to that of a night light. A bit like watching the sun through your hand. An ultrasound study has shown that when you turn a torch in the eyes of a baby in late pregnancy, he brings his hands to his eyes. But the light is not strong enough to wake him up if he's asleep.

During a third-trimester ultrasound,a doctor would expect to observe: 'response to noise and light' in a fetus.

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