The Science of the Baby’s First Yawn Before Birth

Baby’s first yawn can be precious to watch in an ultrasound scan. This simple act is a sign of neurological and lung development in your baby. This blog explains why and when your baby may yawn and also provides insight into what it could mean for their health.

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Babies can surprise you with their growth in the womb. The first yawn before your baby is born is one such moment, which shows their progress in developing lungs and the nervous system. This yawn can feel special, but it also reveals something crucial about their health.

What Does a Baby’s Yawn Look Like in the Womb?

Babies can yawn long before they take their first breath outside the womb. It happens when your baby starts making mouth movements at around 11 weeks of pregnancy. The opening of the mouth wide open and jaw stretching can be clearly seen in a 20-week ultrasound scan. You can also see a hiccup-like reflex around the same time.

However, this adorable yawn also shows that your baby’s brain and body are developing normally, like they should. The most astonishing fact is that researchers found that the yawn pattern in the foetus mimics the adult yawn pattern.

Why Do Babies Yawn Before Birth?

Many reasons justify the yawn in the womb.
  • Brain and Nervous System Development: Yawning requires the nerves in the brain to work, which supports motor control and reflex development after birth.
  • Lung and Respiratory Readiness: Yawning is like an exercise for the lungs and diaphragm, allowing a baby to prepare for their first breath.
  • Temperature Regulation: Some studies suggest that yawning is a way to regulate brain temperature. It is a vital part of your baby’s growth.
  • Muscle Development: Every yawn stretches tiny muscles in the face, jaw, and neck, which are crucial for feeding and facial expressions after birth.

When Do Babies Start Yawning in the Womb?

According to most research, yawning can be observed as early as 11 weeks of pregnancy, but it becomes noticeable around 20-28 weeks, as detected by ultrasound. They also become more regular, along with the stretches, kicks, and hiccups, between 24-28 weeks.

These movements may seem too small to notice on your own, but your doctor can see them during ultrasounds. Babies are unique, so the frequency of each movement may vary.

Can You See the First Yawn During an Ultrasound?

Ultrasound scans can allow you to see foetal yawns between 20 and 30 weeks. A yawn lasts for around 1-5 seconds, making it different from other random mouth movements, such as swallowing or sucking.
It can evoke a wide range of emotions as a parent to see your baby engage in physical movements. It also shows that they are growing and developing movements to prepare for life after birth.

Is Yawning in the Womb a Sign of a Healthy Baby?

Yawning is a natural reflex and reflects the neurological maturity of the baby. However, you do not have to worry if you do not observe it during any of your ultrasounds.
The crucial thing to be mindful of is the regular movement of your baby and their growth within expected percentiles.

How Many Times Do Babies Yawn Before Birth?

Studies show that babies may yawn 4-5 times per hour during the middle stage of pregnancy, but this number may vary. The factors that influence this number are your baby’s sleep pattern and gestational age. Your activity may also affect the frequency of your baby's yawns.

If your baby yawns less frequently, it does not mean anything is wrong. Remember that every baby grows at their own pace.

What Can Affect Your Baby’s Yawning Patterns?

The yawning patterns may change due to the reasons listed below.
  • Maternal stress: High levels of stress can impact fetal movement patterns.
  • Medication: Some medications may slightly change fetal activity.
  • Sleep and activity cycles: Your baby rests and wakes up just like you do.

How Can You Encourage Healthy Fetal Development?

You can support the overall development of your baby rather than focusing on a particular movement.
  • Eat nutritious foods: Folic acid, iron, calcium, and omega-3 fatty acids help in the neurological and physical development of the baby.
  • Stay active: Walking or prenatal yoga improves circulation for both you and your baby.
  • Rest well: Your baby has natural sleep cycles, and the quality of your sleep environment can significantly impact their comfort.
  • Bond with your baby: Talking, singing, or playing gentle music may stimulate the baby's senses and support their emotional development.

When to Consult Your Doctor

Consult your doctor if you notice any of the following signs.
  • Significant decreases in overall foetal movement after 28 weeks.
  • Unusual patterns or extreme inactivity that persists for an extended period.
  • Signs of high blood pressure, bleeding, or severe pain in the mother.

What to Do Next: A Simple Checklist

Support your baby’s healthy development and enjoy small moments while they last.
  • Go to all your regular prenatal checkups and ultrasounds.
  • Track the daily movements of your baby after 28 weeks.
  • Eat nutritious foods and follow a light exercise routine.
  • Talk or sign to your baby to develop a bond.
  • Seek medical advice if you notice unusual changes.
The first yawn before birth is a sign of muscle and brain coordination in your baby. It shows that their lungs and nerves are developing as expected, as they prepare for life outside the womb. You feel a deeper emotional connection with your baby when you see these small movements. Hold on to these special moments, as they also give you assurance in their development.

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FAQs on The Science of the Baby’s First Yawn Before Birth


  1. Can I tell if my baby is yawning at home?
    Identifying yawning at home may be harder without an ultrasound. So, track your baby’s daily movements, kicks and stretches to know they are healthy.
  2. Do all babies yawn in the womb?
    Most babies begin to yawn from 20 weeks, but the frequency differs for each of them. It is also normal if they do not yawn from time to time.
  3. Is fetal yawning linked to sleep patterns?
    Babies follow their sleep and wake cycles, and yawns may appear more often during transitions. It also helps them regulate their neurological activity.
Disclaimer: Medically approved by Dr Seema Sharma, Senior Consultant - Department of Obestrics and Gynecology, Cloudnine Group of Hospitals, Delhi