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Highlights of this Week >>
Pregnancy Symptoms >>
Weekly Checklist >>
Your Pregnant Belly >>
Baby Development >>

Congratulations on reaching the 13th week of pregnancy! This is a big milestone, as your baby is now officially classified as a fetus rather than an embryo. Over the next few weeks, your baby will continue to grow and develop at a rapid pace.

Your Baby is the Size of a Large Boiled Egg


2.9 inches

Head to Toe


.81 ounces

Highlights of the Week

  • Your baby is about the size of a boiled egg, measuring around 2.9 inches (7.4 centimeters) from crown to rump.
  • You’re entering the second trimester, often referred to as the “honeymoon phase” of pregnancy, marked by reduced nausea and increased energy.
  • Your baby’s major organs and structures are now in place and will continue to mature throughout the pregnancy.
  • Your baby’s unique fingerprints are forming during this time.
  • Your baby’s facial features are becoming more distinct, with eyes moving closer together and ears shifting into place.
  • You might start considering maternity clothing for comfort as your belly begins to grow.

Pregnancy Symptoms in Week 13

Cramping: At 13 weeks pregnant, some women may still experience occasional mild abdominal cramping. These cramps are typically caused by the stretching of the uterine muscles and ligaments to accommodate the growing fetus. As long as the cramping is not severe or accompanied by bleeding, it is usually considered normal. However, if you have concerns, it’s always a good idea to consult with your healthcare provider for reassurance.

Appetite: During the second trimester, which includes the 13th week, many women find that their appetite starts to return or increase. The nausea and food aversions that are common during the first trimester often begin to subside, allowing pregnant individuals to enjoy a wider variety of foods. It’s important to focus on a balanced and nutritious diet to support the developing baby’s needs.

Stuffy Nose: Nasal congestion or a stuffy nose is a common pregnancy symptom due to hormonal changes and increased blood flow to the mucous membranes. This congestion can make breathing through the nose difficult. Using a humidifier, saline nasal drops, or a pregnancy-safe decongestant recommended by your healthcare provider can help alleviate this discomfort.

Visible Veins: Many pregnant individuals notice an increase in the visibility of veins, particularly in the breasts and abdomen. This is a result of increased blood volume and hormonal changes. The veins may appear more prominent and bluish in color. This is a normal pregnancy symptom and usually resolves after childbirth.

Vaginal Discharge: Vaginal discharge, known as leukorrhea, tends to increase during pregnancy. At 13 weeks, you may notice an increase in this clear or milky discharge. This is your body’s way of protecting the birth canal from infection. If the discharge becomes foul-smelling, green, yellow, or bloody, or if it’s accompanied by itching or irritation, it’s important to consult your healthcare provider as it could be a sign of infection.

Heartburn: Heartburn or acid reflux can become more pronounced as the pregnancy progresses. The growing uterus can put pressure on the stomach, pushing stomach acids into the esophagus. To manage heartburn, consider eating smaller, more frequent meals, avoiding spicy or acidic foods, and propping up your upper body with extra pillows while sleeping.

New Energy: The second trimester is often referred to as the “honeymoon phase” of pregnancy because many women experience a boost in energy. The fatigue that was common in the first trimester tends to subside, and you may feel more like yourself again. It’s an excellent time to engage in prenatal exercises or enjoy some light physical activity.

Breast Growth and Tenderness: Breast changes continue at 13 weeks pregnant. You may notice that your breasts have increased in size and are more tender than usual. The areolas (the dark area around the nipples) may also darken, and the Montgomery’s tubercles (small bumps on the areolas) may become more prominent. These changes are due to hormonal fluctuations and are a normal part of pregnancy.

Remember that every pregnancy is unique, and while these symptoms are common at 13 weeks, not all individuals will experience them in the same way or to the same degree. If you have any concerns about your pregnancy or experience severe symptoms, it’s always best to consult with your healthcare provider for personalized guidance and care.

13 Week Pregnancy Checklist

Healthcare Appointments: Schedule or attend your 13-week prenatal checkup. Discuss any concerns or questions with your healthcare provider. Confirm the date of your next prenatal appointment.

Nutrition and Diet: Maintain a balanced and nutritious diet with a focus on fruits, vegetables, lean proteins, and whole grains. Continue taking your prenatal vitamins as recommended by your healthcare provider.Stay hydrated by drinking plenty of water throughout the day.Consider discussing any dietary concerns or cravings with your healthcare provider.

Exercise and Physical Activity: Engage in regular, safe prenatal exercises to promote physical fitness and well-being. Discuss your exercise routine with your healthcare provider to ensure it’s suitable for your pregnancy.

Hygiene and Self-Care: Practice good hygiene to prevent infections, including proper handwashing. Use a pregnancy-safe skincare routine to address any skin changes. Maintain dental health with regular dental checkups and cleanings.

Rest and Relaxation: Prioritize getting enough sleep each night to combat fatigue and support your body’s needs. Consider relaxation techniques like prenatal yoga, meditation, or deep breathing exercises to reduce stress.

Symptom Monitoring: Monitor and track any pregnancy symptoms or discomforts, such as cramping, nausea, or heartburn. Contact your healthcare provider if you experience any severe or concerning symptoms.

Medications and Supplements: Ensure that you’re only taking medications or supplements approved by your healthcare provider. Follow your provider’s instructions regarding any prescription or over-the-counter medications.

Safety Precautions: Avoid exposure to harmful substances, such as tobacco smoke, alcohol, and illicit drugs. Be cautious when using cleaning products and ensure good ventilation in the home. Practice safe driving and use seatbelts properly.

Planning for the Future: Start thinking about your birth plan and preferences for labor and delivery. Consider enrolling in prenatal classes to prepare for childbirth and newborn care. Review your maternity leave and financial plans for after the baby arrives.

Emotional Well-being: Take time for self-care and relaxation to manage stress and anxiety. Share your feelings and concerns with a trusted friend, partner, or therapist. Consider joining a pregnancy support group for additional emotional support.

This checklist can serve as a helpful guide to ensure you’re taking the necessary steps to have a healthy pregnancy.

Your 13 Week Pregnant Belly

At 13 weeks pregnant, your belly may start to show subtle signs of pregnancy. While the size of your belly can vary from person to person, it’s common for most individuals to notice a slight rounding of their lower abdomen. This change is due to the growing uterus, which is now about the size of a lemon, and it’s beginning to push above the pelvic bone. You might not appear obviously pregnant to others just yet, especially if this is your first pregnancy, but you’ll certainly feel the changes happening within your body.

As your uterus continues to expand to accommodate your growing baby, you may experience some discomfort. You might notice increased pressure on your bladder, leading to more frequent trips to the restroom. Some women may also experience mild lower abdominal cramping as the ligaments supporting the uterus stretch and adjust. This is usually normal, but it’s important to mention any severe or persistent pain to your healthcare provider.

Your breasts may also continue to change and might be fuller and more tender. The darkening of the areolas (the area around the nipples) and the appearance of visible veins on the breasts can be normal developments at this stage. You may notice some skin changes, such as the “linea nigra,” a dark line that can appear on your abdomen, and the development of the “mask of pregnancy” or melasma, which can cause darkened patches on your face. These changes are largely driven by hormonal fluctuations and are typically temporary.

To ensure the well-being of both you and your baby, it’s crucial to prioritize self-care. Continue to maintain a healthy and balanced diet, focusing on essential nutrients like folic acid, iron, and calcium. Staying hydrated is equally important, so drink plenty of water throughout the day.

As your belly continues to grow, you may find it helpful to invest in maternity clothing that offers comfort and support. Maternity pants, leggings, and tops designed to accommodate your changing body can make a significant difference in your comfort level.

Engaging in regular, safe prenatal exercises can help alleviate some of the discomfort associated with a growing belly. Activities like prenatal yoga and swimming can help improve your strength, flexibility, and overall well-being.

Your 13-week belly is starting to show its presence, and while it may bring some physical changes and discomfort, it’s all part of the beautiful process of nurturing new life. By taking care of your body through proper nutrition, exercise, and self-care, you can help ensure a healthy and positive pregnancy experience.

Baby Development at 13 Weeks

Baby development at 13 weeks pregnant marks a significant milestone as your little one continues to grow and develop rapidly. At this stage, your baby is approximately the size of a large boiled egg, measuring about 2.9 inches (7.4 centimeters) from crown to rump and weighing around 0.81 ounces (23 grams). While still quite tiny, your baby has made remarkable progress since conception.

Special considerations during this period include the development of several critical organ systems. By 13 weeks, most of your baby’s major organs and structures are in place, and they will continue to mature and refine throughout the remainder of the pregnancy. The liver is actively producing bile, and the kidneys are starting to excrete urine into the amniotic fluid. Your baby’s bone marrow is also beginning to produce white blood cells, contributing to their developing immune system.

One exciting aspect of baby development at this stage is that your baby’s unique fingerprints are forming. These tiny ridges and whorls are becoming more defined and will remain the same for the rest of their life. Additionally, your baby’s facial features are becoming more distinct, with eyes moving closer together and ears gradually shifting into their proper positions.

It’s important to note that while many of your baby’s organ systems are now functional, they are still in the process of maturing. Therefore, maintaining a healthy lifestyle, including proper prenatal care, nutrition, and avoiding harmful substances like tobacco and alcohol, is crucial to support your baby’s continued growth and development. Regular prenatal checkups with your healthcare provider will help ensure that your baby is progressing as expected, and any potential concerns can be addressed promptly to promote a healthy pregnancy.

How Many Months is 13 Weeks Pregnant?

At 13 weeks pregnant, you are in the beginning of the second trimester. Pregnancy is typically divided into three trimesters, each lasting approximately three months. Therefore, 13 weeks pregnant is equivalent to approximately 3 months and 1 week into your pregnancy.