When Do Lungs Develop In Baby?

As expectant mothers, it is only natural to wonder when the vital organs of our babies start to develop. The lungs, being one of the most important organs, have a significant role in the baby’s survival outside the womb. So, when do lungs develop in a baby? Let’s explore the details of this fascinating process.

Embryonic Stage

During the embryonic stage, which starts from conception until the eighth week of pregnancy, the baby’s lungs begin to develop. At this stage, the baby’s lungs are just tiny buds. These buds will continue to grow and develop over the coming weeks and months.

When Do Lungs Develop In BabySource: bing.com

Fetal Stage

Once the embryonic stage is over, the fetal stage begins. This stage starts from the ninth week of pregnancy until the baby is born. During this stage, the lungs continue to develop, and they take on a more complex structure.

At around 16 weeks, the baby begins to breathe in small amounts of amniotic fluid, which helps the lungs to develop further. By the 20th week of pregnancy, the lungs have developed to a point where they can start producing a substance called surfactant. Surfactant is crucial for breathing, as it helps to keep the air sacs in the lungs open, allowing for proper exchange of oxygen and carbon dioxide.

Third Trimester

During the third trimester of pregnancy, the lungs continue to mature. The baby’s breathing movements become more regular, and they start to practice inhaling and exhaling. These movements help the lungs to develop further and prepare the baby for life outside the womb.

Read Also  Do Babies Develop In The Uterus?

Towards the end of the third trimester, the baby’s lungs are fully developed, and they are ready to take their first breath. However, it is important to note that if a baby is born prematurely, their lungs may not be fully developed, and they may require medical intervention to help them breathe.


In conclusion, the development of the lungs in a baby is a fascinating and intricate process. It starts during the embryonic stage and continues throughout the pregnancy until the baby is born. As mothers, it is essential to take good care of ourselves during pregnancy to ensure that our babies’ organs develop correctly. Eating a healthy diet, getting enough rest, and avoiding harmful substances such as cigarettes and alcohol can help in the proper development of our babies’ lungs and other vital organs.

Frequently Asked Questions About When Do Lungs Develop In Baby

Q: Can a baby’s lungs be fully developed before 37 weeks?

A: It is possible, but it is not guaranteed. Babies born before 37 weeks may require medical intervention to help them breathe.

Q: What happens if a baby’s lungs are not fully developed?

A: If a baby’s lungs are not fully developed, they may require medical intervention to help them breathe. In severe cases, they may need to be put on a ventilator.

Q: Can a mother’s smoking affect the development of her baby’s lungs?

A: Yes, smoking during pregnancy can affect the development of the baby’s lungs and increase the risk of respiratory problems.

Q: What can a mother do to help her baby’s lungs develop properly?

Read Also  When Do Babies Motor Skills Develop?

A: To help the baby’s lungs develop properly, a mother should eat a healthy diet, get enough rest, and avoid harmful substances such as cigarettes and alcohol.

Q: When is a baby’s lungs considered fully developed?

A: A baby’s lungs are considered fully developed towards the end of the third trimester, around 35 to 36 weeks of pregnancy.

Related video of When Do Lungs Develop In Baby?

By administrator

I am a child development specialist with a strong passion for helping parents navigate the exciting and sometimes challenging journey of raising a child. Through my website, I aim to provide parents with practical advice and reliable information on topics such as infant sleep, feeding, cognitive and physical development, and much more. As a mother of two young children myself, I understand the joys and struggles of parenting and am committed to supporting other parents on their journey.

Leave a Reply

Your email address will not be published. Required fields are marked *