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Getting ready to meet your baby!
Pregnancy

Getting ready to meet your baby!

2 min readWeek 40
Key takeaways
2 min
  • Monitor your baby's development as all organs are fully formed and functioning by 39 weeks of pregnancy.
  • Prepare for delivery by understanding your baby's lung maturation and surfactant production for independent breathing.
  • Recognize your baby's activity and rest patterns, which synchronize with heart rate and movement cycles.
  • Plan for twins by establishing individual breastfeeding routines before attempting simultaneous nursing.
  • Expect newborn breathing to be irregular with pauses up to five seconds as respiratory centers continue developing.

At 39 weeks of pregnancy, your baby is ready for birth with fully formed organs, mature lungs producing surfactant for breathing, and thick skin for temperature regulation. This marks a healthy full-term pregnancy milestone.

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Getting ready to meet your baby!

Your baby could arrive any day now! All of their organs are fully formed and working. By now, your baby's skin is thick enough to protect their internal organs and regulate heat exchange [1]. A growing subcutaneous layer of fat will make your baby round and plump [2].

Getting ready to meet your baby! - Getting ready to meet your baby!The lungs are now producing more surfactant, a substance that helps air bubbles open. With their help, your baby will be able to breathe independently [3].

Respiratory activity has improved thanks to the development of the corresponding centers in the central nervous system. They will continue to develop even after the baby is born. Newborn babies breathe intermittently and irregularly and can pause for up to five seconds [3].

By this week, your baby has developed clear states of activity and rest. In the active phase, the eyes move quickly, while in the passive phase, they remain almost motionless. These periods are synchronized with the heart rate and movements of the head, arms, and legs.

After the baby is born, the doctor will assess their health on the Apgar scale, which takes into account heart rate, breathing rhythm, muscle tone, reflexes, and skin color [3].

If you are expecting twins

Twins should be brought to the breast as soon as possible after childbirth. Of course, it’s more challenging to manage two, so it’s important for you to receive proper support from the dad, family and medical staff. Each of the babies can have their own style and rhythm of feeding, one can nurse often and little, and the other longer but with noticeable spacing. In the first few days, it is better to put the babies to the breast in turns to focus on particular sensations and understand how well each child latches to the nipple and how actively he or she nurses [4]. Later, you can train yourself to nurse them simultaneously. If, of course, they cooperate!

What can be seen on the ultrasound

Here, we see the baby's head from above. The dotted line indicates its circumference and diameter. It now measures almost four inches (96 mm).

Getting ready to meet your baby! - Getting ready to meet your baby!
Frequently asked questions

At 39 weeks, your baby's organs are fully formed and working. Their skin is thick enough to regulate temperature, and lungs are producing surfactant for independent breathing after birth.

Yes, newborn breathing is naturally intermittent and irregular. Babies can pause breathing for up to five seconds as their respiratory centers continue developing after birth.

Start by nursing twins individually to understand each baby's feeding pattern and latch. Once comfortable, you can transition to simultaneous feeding with proper support from family and medical staff.

At 39 weeks, ultrasound measures the baby's head circumference and diameter, which typically reaches about four inches (96mm). This helps assess proper fetal growth and development.

Medical Disclaimer

This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or qualified health provider with any questions you may have regarding a medical condition.

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Medically reviewed content

Reviewed by healthcare professionals · Updated June 3, 2025

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