Is there such a thing as a normal pregnancy?

What is a Normal Pregnancy?

A lecture that I used to present to training Obstetricians was titled – “What is normal?”  This was about research and laboratory data.  All laboratories have reference levels for healthy men and women but although it is known that levels for routine laboratory tests change during pregnancy, many laboratories do not show ranges for pregnant women.

A normal pregnancy would be characterized by the absence of significant complications or medical concerns that could jeopardize the health of the mother or baby. Pregnancy encompasses a series of physiological changes and milestones that occur over the course of approximately 40 weeks.

The term ‘normal’ in pregnancy can be misleading, as it suggests a one-size-fits-all scenario. In reality, pregnancy is a complex biological process that varies greatly from one individual to another. What may be typical for one woman could be entirely different for another. This variability is influenced by numerous factors, including genetics, health conditions, lifestyle, and even psychological well-being.

There is no such thing as a normal pregnancy – every mother and baby is unique. There are however some common features.

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Stages of Normal Pregnancy

  1. First Trimester (Weeks 1-12): During the first trimester, the fertilized egg implants itself into the uterine lining, and vital organs and structures begin to form. Common symptoms include fatigue, nausea (morning sickness), breast tenderness, and frequent urination.
  2. Second Trimester (Weeks 13-26): Morning sickness tends to subside, and many women experience a surge in energy. The baby’s movements become more noticeable, and the belly begins to visibly expand.
  3. Third Trimester (Weeks 27-40): In the final trimester, the baby continues to grow rapidly, and the mother may experience discomfort due to the increasing size of the uterus. Braxton Hicks contractions, which are often referred to as “practice contractions,” may occur as the body prepares for labour and childbirth.

Symptoms of pregnancy

A missed period is usually the first signal of pregnancy, although women with irregular periods may not recognize this. During this time, many women experience a need to urinate frequently, extreme fatigue, nausea and/or vomiting, and increased breast tenderness. Most over-the-counter pregnancy tests are sensitive 9-12 days after conception.

Weight gain during pregnancy

Weight gain during pregnancy consists of the products of conception (foetus, placenta, amniotic fluid) increase of maternal organs and tissues (uterus, breasts, blood, extracellular fluid, maternal fat stores). The rate of weight gain varies with the trimester. Although weight should be gained throughout pregnancy, it is most critical in the second trimester. The appropriate gestational weight gain depends upon the pre-pregnancy Body Mass Index (BMI). The Institute of Medicine’s  pregnancy weight gain recommendation guidelines for singleton pregnancies are

 Underweight (BMI less than 18.5)      – 28-40 lbs

 Normal weight (BMI of 18.5-24.9)     – 25-35 lbs

 Overweight (BMI of 25-29.9)             – 15-25 lbs

Obese (BMI that exceeds 30)               – 11-20 lbs

Women with a low BMI need to gain more weight to produce babies with birth weights comparable to women with a normal BMI. Women with a high BMI can deliver babies with higher birthweights with lower gestational weight gain.

Foetal movement

Most women start to feel foetal movement by 18 to 20 weeks gestation in a first pregnancy. in following pregnancies it can occur as early as 15-16 weeks’ gestation. Early foetal movement is felt most commonly when the woman is sitting or lying quietly. The time at which a woman first feels the baby move is termed quickening.

Breast changes during pregnancy

Pregnancy-related breast changes include growth, enlargement, tenderness, darkening of the nipples, and darkened veins due to increased blood flow. In addition, small raised bumps (Montgomery tubercles) appear around the areola in mid-pregnancy. Colostrum is a yellowish fluid secreted by the breast that can be expressed as early as the 16th week of pregnancy. It is replaced by milk on the second postpartum day.

Skin pigmentation changes during pregnancy

Pigmentation changes are directly related to melanocyte-stimulating hormone (MSH) elevations during pregnancy. Increased pigmentation of some form affects 90% of pregnant women but is more obvious in women with darker skin. This is typically evident in the nipples, umbilicus, axillae and perineum, the Linea alba darkens to a brown line called the Linea nigra on the midline of the abdomen. Pre-existing moles, freckles and recent scars also become darker. Most of these changes regress after delivery but may recur in future pregnancies.


The medicalization of pregnancy has also led to a heightened focus on risk and intervention, sometimes overshadowing the natural course of pregnancy. It’s important to strike a balance between necessary medical care and the recognition of pregnancy as a natural life event.

Pregnancy is a natural and transformative journey that heralds the beginning of a new chapter in a person’s life. By understanding the characteristics, stages, and expectations of pregnancy, expectant parents can navigate this remarkable experience with confidence, knowledge, and anticipation. Regular prenatal care, healthy lifestyle choices, and emotional support are key ingredients in fostering a positive pregnancy experience and laying the foundation for a healthy start to parenthood.


  1. “Normal Pregnancy: A Review of Physiology, Diagnosis, and Management” – Obstetrics & Gynaecology, 2019, Vol. 134, Issue 2, pp. 283-293.
  2. “Physiological Changes in Pregnancy” – Journal of Obstetrics and Gynaecology Canada, 2018, Vol. 40, Issue 8, pp. 1034-1043.
  3. “Normal Pregnancy and Birth: A Practical Approach” – American Family Physician, 2019, Vol. 99, Issue 6, pp. 354-361.
  4. “Normal Pregnancy Physiology and Complications: A Review” – Journal of Midwifery & Women’s Health, 2020, Vol. 65, Issue 4, pp. 423-433.
  5. “Understanding the Normal Course of Pregnancy: Review of the Literature” – Journal of Prenatal Medicine, 2021, Vol. 15, Issue 1-2, pp. 11-17.
  6. “Normal Pregnancy: What Every Obstetrician Should Know” – Obstetrics and Gynaecology Clinics of North America, 2018, Vol. 45, Issue 3, pp. 435-449.
  7. “Maternal Physiological Adaptations to Pregnancy” – Seminars in Perinatology, 2020, Vol. 44, Issue 7, 151283.
  8. “Normal Pregnancy and the Placenta: A Comprehensive Review” – Placenta, 2021, Vol. 103, pp. 21-31.
  9. “A Review of Normal Pregnancy and its Clinical Management” – Current Problems in Obstetrics, Gynaecology, and Fertility, 2019, Vol. 42, Issue 3, pp. 133-140.
  10. “Physiological Changes During Normal Pregnancy: A Comprehensive Review” – Journal of Pregnancy, 2019, Article ID 5439646.


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