Week 40 of Pregnancy

At week 40 of pregnancy, your baby is approximately the size of a small pumpkin, measuring about 51.2 cm in length and weighing 3462 grams. This is an exciting time in the third trimester as your baby continues to grow and develop at a remarkable pace.

This week brings several important developmental milestones. Your due date has arrived! The average baby weighs about 7.5 pounds and measures 20 inches. All body systems are ready for the outside world. The skull bones remain flexible and will mold to fit through the birth canal. These changes mark significant progress in your baby's journey from a cluster of cells to a fully formed newborn.

In terms of organ system development, your baby's body is making impressive strides this week. All systems fully mature and ready for postnatal life. Skull bones designed to overlap for birth. Immune system equipped with maternal antibodies. Lungs ready for first breath of air. Each of these developments builds upon the work of previous weeks, creating increasingly complex and functional body systems that will sustain your baby after birth.

Additional developments this week include several noteworthy changes. Fat makes up about 15% of body weight for temperature regulation. Chest is prominent and full. The fetus has 300 bones (adults have 206 -- many will fuse as the child grows). Antibodies from the placenta provide immune protection for the first few months. The baby is ready to meet you!. Every day brings new progress, even when the changes are too small to see or feel.

Regarding movement and sensory development, Movements should still be felt regularly even at 40 weeks. Baby may feel very low and heavy in the pelvis. Less room for movement but activity should continue. Report any significant decrease in movement immediately. As your baby grows, you may notice patterns in their activity -- many babies are most active in the evening or when you are resting quietly.

Compared to last week, your baby has made noticeable progress. The growth rate during the third trimester is focused primarily on weight gain and organ maturation. Each week builds upon the last, creating a beautifully orchestrated sequence of development that has been refined over millions of years of human evolution.

Week 40 brings a variety of physical changes as your body continues to adapt to your growing baby. Understanding what is happening and why can help you feel more prepared and less anxious about the changes you are experiencing.

The most common physical symptoms during week 40 include several that you may already be familiar with and some that may be new. May feel incredibly ready for labor to begin. Cervix may or may not show signs of labor readiness. Braxton Hicks may be very strong. Increased pelvic pressure and discomfort. These symptoms are driven by the hormonal and physical changes that pregnancy demands of your body, and while they can be uncomfortable, they are generally signs that your pregnancy is progressing normally.

You may also experience possible loss of mucus plug or bloody show. nesting behavior may be intense. difficulty sleeping and finding comfortable positions. emotional roller coaster of waiting. Not every woman experiences all of these symptoms, and their severity varies widely from person to person and even from one pregnancy to the next. If any symptom feels unusually severe or is interfering with your daily life, do not hesitate to discuss it with your healthcare provider.

Emotionally, week 40 can bring its own set of experiences. Impatience and frustration are completely normal. Excitement that the day is very close. May feel emotional about the pregnancy ending and a new chapter beginning. Trust in your body and the process. Some women feel a calm readiness, others feel anxious. Gratitude for the journey you have been on. These emotional shifts are influenced by hormonal changes, physical discomfort, sleep disruption, and the psychological weight of preparing for parenthood. The third trimester can feel emotionally intense as the reality of labor and meeting your baby draws closer.

Your energy levels during week 40 may be declining again as the physical demands of the third trimester take their toll. Growing a full-sized baby requires enormous energy, and disrupted sleep adds to the fatigue. Prioritize rest, nap when possible, and accept help from others.

If this is your first pregnancy, many of these symptoms may feel unfamiliar and potentially worrying. Rest assured that the vast majority of pregnancy symptoms, while uncomfortable, are entirely normal. Women who have been pregnant before may recognize these symptoms more readily, though every pregnancy is different and symptoms that were present in one pregnancy may be absent in another (and vice versa). Your body has its own unique way of responding to pregnancy.

It is completely normal to have questions and worries during week 40 of pregnancy. Here are some of the most common concerns at this stage and what you need to know about them.

Only 5% of babies arrive on their exact due date. Going past your due date is common and usually safe up to 41-42 weeks. Induction is typically recommended between 41-42 weeks. Post-term pregnancy monitoring ensures baby remains healthy. Every labor story is unique -- comparison to others is not helpful.

While most pregnancy symptoms are normal, certain warning signs require prompt medical attention. Contact your healthcare provider if you experience: Regular contractions meeting the 5-1-1 rule; Water breaking (note the color, odor, and time); Vaginal bleeding; Decreased fetal movement; Meconium-stained fluid (green or brown); Fever, chills, or feeling unwell; Any instinct that something is not right -- trust yourself. When in doubt, it is always better to call and be reassured than to wait and worry. Your healthcare team expects these calls and would rather hear from you than have you suffer in silence.

Remember that every pregnancy is unique, and comparing your experience to others -- whether friends, family, or online forums -- is rarely helpful. What matters most is that you are receiving regular prenatal care, paying attention to your body, and communicating openly with your healthcare provider. Trust the process, trust your body, and do not hesitate to seek support when you need it.

This information is provided for educational purposes and should not replace personalized advice from your healthcare provider. Always consult your OB-GYN, midwife, or other qualified healthcare professional with specific questions about your pregnancy.