Prenatal Care

Part of Midwifery and Childbirth

The full system of monitoring and support for pregnant women from confirmation of pregnancy through the onset of labor.

Why This Matters

Prenatal care is the systematic monitoring of pregnancy to detect complications early, provide interventions that prevent problems, and prepare mother and birth attendant for delivery. Its impact on maternal and neonatal survival is enormous: communities with structured prenatal care have maternal mortality rates ten to fifty times lower than those without, not because the care is technologically sophisticated, but because it identifies risk before crisis develops.

The core insight of prenatal care is that most of the conditions that kill mothers and babies — preeclampsia, malpresentation, gestational diabetes, placenta previa, isoimmunization — are detectable in advance. Once detected, many of them can be managed or mitigated. A woman who arrives at labor already identified as high-risk, with a planned response to anticipated complications, survives situations that would kill someone who arrived unmonitored.

In a resource-limited setting, prenatal care strips down to its essentials: regular visits, systematic assessment of mother and fetus, identification of risk factors, and planning for complications. No laboratory equipment is required to detect most dangerous conditions — a trained attendant with a fetoscope, a blood pressure cuff, a measuring tape, and systematic examination skills can provide the most critical elements.

Confirming Pregnancy

Presumptive signs (suggest but do not confirm pregnancy):

• Missed menstrual periods (most reliable in women with regular cycles)
• Nausea and vomiting (especially in the morning, typically weeks 6-12)
• Breast tenderness, enlargement, darkening of the areolae
• Frequent urination
• Fatigue
• Food cravings or aversions

Probable signs:

• Uterine enlargement on examination (fundus palpable above pubic bone after week 12)
• Softening of the cervix (Goodell’s sign)
• A positive urine pregnancy test (urine hCG test strips remain functional for years if stored dry and cool)

Positive signs (definitive):

• Fetal heart sounds heard by fetoscope (audible from approximately 20 weeks)
• Fetal movement felt by the examiner (from approximately 20 weeks)
• Ultrasound — unavailable without equipment

Estimated due date: The standard calculation: add 9 months and 7 days to the first day of the last normal menstrual period (Naegele’s rule). A more direct calculation: add 280 days (40 weeks) to the LMP. This estimate has approximately a 2-week margin of error even with certain menstrual dates.

Initial Assessment

The first prenatal visit should be as early as possible, ideally before 12 weeks. It establishes baseline data and identifies existing high-risk factors that will shape management throughout pregnancy.

History:

• Last menstrual period and regularity of cycles
• Number of previous pregnancies, births, miscarriages, and outcomes
• Complications in previous pregnancies (preeclampsia, hemorrhage, cesarean)
• Medical conditions (hypertension, diabetes, heart disease, epilepsy, tuberculosis)
• Current medications
• Allergies
• Family history of twins, congenital conditions, pregnancy complications
• Social situation — partner, family support, nutrition access, housing

Physical examination:

• Height and weight (calculate BMI if possible)
• Blood pressure (establish baseline — critical for detecting preeclampsia later)
• Heart and lung auscultation
• Abdominal examination
• Pelvic examination if indicated (assess pelvic dimensions for potential obstructed labor)

Blood type and Rh factor: If testing is available, determine blood type and Rh status. A woman who is Rh-negative carrying an Rh-positive fetus may develop antibodies against fetal blood cells in subsequent pregnancies, causing hemolytic disease of the newborn. Prevention requires Rh immunoglobulin (Rhogam) administration at 28 weeks and after delivery — if this is unavailable, be aware of the risk in subsequent pregnancies.

Hemoglobin: Simple hemoglobin measurement identifies anemia for treatment before labor. Without laboratory capacity, clinical signs of severe anemia (pale inner eyelids, extreme fatigue) can be assessed, but these only detect severe anemia.

Visit Schedule and Timing

The WHO recommends a minimum of 8 antenatal visits for uncomplicated pregnancies, but even 4 well-conducted visits substantially reduce mortality. The timing is designed to capture complications when they commonly emerge.

Minimum visit schedule:

1. Before 12 weeks — initial assessment and baseline
2. 20 weeks — fetal growth assessment, fetal position
3. 28 weeks — anemia assessment, begin preeclampsia surveillance
4. 36 weeks — fetal presentation, birth planning

For high-risk pregnancies:

• More frequent visits based on specific risk factor
• Previous cesarean: assess scar integrity in third trimester
• Multiple pregnancy: every 2-3 weeks from 20 weeks
• Known hypertension: weekly blood pressure monitoring from 28 weeks

Ongoing Monitoring at Each Visit

Blood pressure: The most important measurement at each prenatal visit. Normal range: systolic below 140, diastolic below 90.

• Record both values and compare to baseline
• Isolated elevated reading: reassess after 30 minutes of rest
• Systolic ≥140 OR diastolic ≥90 on two readings: hypertension — evaluate for preeclampsia
• Systolic ≥160 OR diastolic ≥110: severe hypertension — risk of stroke, immediate intervention needed

Weight: Monitor trend of weight gain. Inadequate gain suggests undernutrition or fetal growth restriction. Sudden excessive gain (more than 1 kg in one week) in the third trimester suggests fluid retention — a sign of preeclampsia.

Urine: If dipstick testing is available, check for protein at each visit from 20 weeks. Significant proteinuria combined with elevated blood pressure defines preeclampsia. Without dipsticks, observe for generalized swelling (face, hands) which accompanies preeclampsia.

Fundal height: Measure the distance from the top of the pubic bone to the top of the uterus (fundus) using a measuring tape. From 20-36 weeks, this measurement in centimeters approximately equals gestational age in weeks (McDonald’s rule). A fundal height significantly below expected suggests fetal growth restriction or wrong dates; significantly above suggests multiple pregnancy, polyhydramnios, or wrong dates.

Fetal heart rate: Audible with a fetoscope (Pinard horn — a simple wooden trumpet device) from approximately 20 weeks. Place the flat end against the mother’s abdomen in the area where fetal back is located, and listen. Count for 60 seconds. Normal range: 110-160 bpm. Record at each visit.

Fetal position: From 32-34 weeks, assess fetal lie (horizontal vs. vertical) and presentation (which part is lowest in the pelvis). Leopold’s maneuvers — a four-step sequence of abdominal palpation — determine:

1. What is in the fundus (head is smooth and round, buttocks is broader and softer)
2. Where the fetal back is (firm resistance on one side)
3. What is presenting (in the pelvis)
4. How far the presenting part has descended into the pelvis

A fetus in breech presentation (buttocks or feet lowest) at 36 weeks should prompt planning for a difficult delivery or referral — unplanned breech deliveries carry much higher risk for the baby.

High-Risk Conditions in Pregnancy

Preeclampsia: Elevated blood pressure + protein in urine + symptoms (headache, visual changes, right upper abdominal pain) after 20 weeks. Can progress to eclampsia (seizures) and stroke. Management: strict blood pressure monitoring, bed rest on the left side, magnesium sulfate (if available) for seizure prevention, prompt delivery if severe. No safe expectant management without hospital capacity.

Gestational diabetes: Elevated blood sugar during pregnancy. Without testing, screen clinically: large baby for gestational age, family history of diabetes, previous large baby. Dietary management (reduce refined carbohydrates, increase protein and vegetable intake) is the first-line intervention.

Anemia: Iron supplementation during pregnancy is the most important single intervention for reducing maternal mortality. If iron tablets are available, all pregnant women should receive them. If not, maximize dietary iron (red meat, legumes, dark leafy greens) with vitamin C to enhance absorption.

Malpresentation: Breech, transverse lie, or face presentation at term. These require consideration of assisted delivery (if skills are available) or planned referral. An unattended transverse delivery is not survivable for the baby without intervention.

Multiple pregnancy: Twin pregnancies are identifiable by examining a fundal height significantly larger than expected, by palpating multiple fetal parts, or by hearing two fetal heart rates in distinct locations with rates that differ by more than 10 bpm. Twins require more frequent monitoring, earlier readiness for delivery, and preparations for potential complications (premature labor, malpresentation, postpartum hemorrhage).

Birth Planning

The third trimester visit should include explicit birth planning:

• Who will attend the delivery?
• Where will delivery occur?
• What is the plan if complications arise (postpartum hemorrhage, fetal distress, failure to progress)?
• Is transport available if referral becomes necessary?
• Are supplies assembled? (See Supply Kit article)
• Has the mother received information about the signs of labor?
• Does the mother have a support person for labor?

Birth planning is not bureaucratic box-ticking — it is the difference between a chaotic response to emergency and a coordinated one. Every woman deserves a plan before she goes into labor.