The postpartum period (puerperium) is traditionally the 6 weeks after birth, during which the reproductive organs return toward the nonpregnant state. Many cardiovascular and emotional changes continue up to 12 weeks or longer ("fourth trimester"). After the placenta is delivered, estrogen, progesterone, and human placental lactogen fall abruptly, triggering most of these changes.

Uterus — involution

• Immediately after birth the fundus is firm, midway between umbilicus and symphysis; it rises to about the level of the umbilicus within about 12 hours
• It then descends about 1 cm (one fingerbreadth) per day; it is usually no longer palpable abdominally by about 2 weeks and near nonpregnant size by 6 weeks
• Weight falls from about 1,000 g after birth to about 60 g at 6 weeks
• Mechanisms: contraction of interlacing muscle fibers (compresses vessels at the placental site), autolysis, and endometrial regeneration. The placental site heals by exfoliation over about 6 weeks
• Afterpains: cramping from intermittent contractions — stronger in multiparas, with overdistension (twins, polyhydramnios), and during breastfeeding (oxytocin release)
• Breastfeeding promotes involution; a full bladder displaces the uterus upward and to the side and inhibits contraction

Lochia

• Lochia normally has a mild, menstrual-like smell. Foul odor suggests infection; return to bright red bleeding after serosa or alba, or a sudden increase in amount, suggests subinvolution or retained tissue
• Flow increases briefly on standing (pooled blood) and with breastfeeding
• After cesarean birth, lochia is often lighter

Cervix, vagina, perineum

• Cervix closes gradually over weeks; the external os becomes a transverse slit
• Vaginal rugae return around 3–4 weeks; low estrogen (especially with breastfeeding) causes dryness
• Perineal edema, bruising, lacerations, or episiotomy; hemorrhoids are common

Cardiovascular and hematologic

• Cardiac output rises immediately after birth (blood returns from the uteroplacental circulation, relief of vena cava compression) — a critical time for clients with heart disease
• Plasma volume falls through diuresis (days 2–5) and diaphoresis (night sweats), removing excess extracellular fluid
• WBC may rise to about 20,000–25,000/mm³ in the first days without infection
• Clotting factors and fibrinogen stay elevated → hypercoagulable state; VTE risk is highest in the first weeks and stays elevated through about 12 weeks
• Pulse normally returns toward baseline; a pulse of about 50–70/min in the first days can be normal (puerperal bradycardia from increased stroke volume); persistent tachycardia suggests hemorrhage, infection, anemia, or VTE
• Hematocrit is interpreted with care in the first days (hemoconcentration vs. blood loss); as a rough guide, a 2-point hematocrit drop reflects about 500 mL of blood loss

Urinary

• Increased bladder capacity with decreased sensation from birth trauma, edema, and anesthesia → urinary retention and overdistension
• Diuresis can produce up to about 3,000 mL/day
• Dilated ureters return to normal over weeks

Gastrointestinal

• Hunger and thirst after birth are normal
• Constipation from decreased tone, fear of perineal pain, hemorrhoids, opioids, and dehydration; first bowel movement usually within 2–3 days
• After cesarean: slower return of bowel function — early ambulation and early feeding help

Musculoskeletal and integumentary

• Abdominal wall laxity; diastasis recti may persist
• Linea nigra and melasma fade; striae lighten

Endocrine and reproductive

• Lactation: prolactin drives milk production; oxytocin causes let-down
• Nonlactating clients may ovulate as early as about 3–4 weeks postpartum; ovulation can occur before the first period in anyone
• Insulin needs drop sharply; gestational diabetes usually resolves
• Postpartum thyroiditis (transient hyperthyroid then hypothyroid phase) can occur in the first year — it is a complication, not normal involution

Breasts

• Colostrum (rich in antibodies and protein) in the first days; milk "comes in" around day 2–5 (lactogenesis II)
• Engorgement around days 3–5: firm, warm, tender breasts; low-grade warmth can occur

Psychological adaptation

• A traditional model (Rubin) describes three maternal phases: taking-in (first 1–2 days — passive, focused on own needs, rest, food, and retelling the birth story), taking-hold (from about day 2–3 — increasing independence, eager to learn infant care; the best time for teaching), and letting-go (weeks later — accepting the new role and relationship changes). Many clients move through these phases faster today, so teaching is tailored to readiness rather than a fixed day
• Bonding and attachment are supported by skin-to-skin contact, rooming-in, and early feeding; behaviors include eye contact in the en face position, touching progressing from fingertips to whole hand, and calling the infant by name
• Baby blues (tearfulness, mood swings) affect many clients in the first days and resolve within about 2 weeks; symptoms that persist or are severe need screening for perinatal depression (covered in Perinatal Mood Disorders)
• Partners and siblings also adapt; sibling rivalry and partner fatigue are common

Vital signs

• Temperature may rise slightly in the first 24 hours (dehydration, exertion); a temperature of 38.0 °C (100.4 °F) or higher still needs evaluation, especially after 24 hours
• BP should be stable; elevation suggests postpartum preeclampsia; a fall suggests hemorrhage

Systematic postpartum assessment (BUBBLE-HE) — Breasts, Uterus, Bladder, Bowel, Lochia, Episiotomy/perineum (REEDA: redness, edema, ecchymosis, discharge, approximation), Homans' sign (now replaced by a leg assessment for calf pain, swelling, and warmth, because Homans' sign is unreliable), Emotions

Fundal assessment technique

• Client voids first, then lies supine with knees slightly flexed
• Support the lower uterine segment above the symphysis with one hand; palpate the fundus with the other
• Record height relative to the umbilicus (e.g., "1 fingerbreadth below," U−1), firmness, and midline position

Normal vs. abnormal

• Hemoglobin/hematocrit on day 1 or after significant blood loss
• Rh status and antibody screen; rubella immunity; infant blood type if the mother is Rh-negative
• Glucose testing at 4–12 weeks after gestational diabetes

• Uterotonics if involution is poor; evaluation for retained tissue if bleeding persists
• Rh(D) immune globulin 300 mcg IM within 72 hours for an unsensitized Rh-negative client with an Rh-positive newborn
• Live vaccines (MMR, varicella) for nonimmune clients before discharge; breastfeeding is not a contraindication; avoid pregnancy for 4 weeks. If Rh immune globulin is also needed, give both, and check rubella immunity about 3 months later because the antibody response may be reduced
• Iron for anemia

Listed in priority order.

1. Prevent and detect hemorrhage — fundus and lochia checks per protocol; massage a boggy fundus until firm (do not overmassage); express clots
2. Bladder — encourage voiding within about 6 hours; privacy, running water, warm water over the perineum; palpate for distension; catheterize if unable to void
3. Vital signs — watch for tachycardia, hypotension, fever, hypertension
4. VTE prevention — early ambulation, hydration, compression devices if ordered
5. Comfort — ice to perineum first 24 hours, then warm sitz baths; analgesia for afterpains (ibuprofen) before breastfeeding
6. Bowel — fluids, fiber, ambulation, stool softener as ordered

• Afterpains are normal and often stronger during breastfeeding; empty the bladder and take ibuprofen as directed
• Lochia changes and what is abnormal (foul odor, heavy bleeding, return of bright red flow)
• Night sweats and frequent urination in the first days are normal
• Ovulation can return before menstruation — use contraception if pregnancy is not desired

• Fundus at the umbilicus within about 12 hours, then descends 1 cm/day; not palpable by about 2 weeks
• Afterpains stronger in multiparas and during breastfeeding
• Lochia rubra (1–3) → serosa (4–10) → alba (10+)
• Foul lochia = infection; sudden increase = subinvolution/retained tissue
• Diuresis days 2–5; diaphoresis normal
• WBC up to about 20,000–25,000 normal early
• Hypercoagulable → early ambulation
• Full bladder → fundus high and deviated
• Assess the fundus after voiding, supporting the lower segment
• Ovulation may return before menstruation