Introduction
Childbirth (parturition) is the process by which the fetus, placenta, and membranes are expelled through the birth canal. Labor is defined as regular uterine contractions that cause progressive cervical dilation and effacement. The average duration of first labor is approximately 12-18 hours, with subsequent labors averaging 6-8 hours.
Onset of Labor
Signs of Approaching Labor
| Sign | Timing | Description |
|---|---|---|
| Lightening | 2-4 weeks before labor (primip); onset of labor (multip) | Fetal head descends into pelvis; easier breathing, increased pelvic pressure |
| Bloody show | 24-72 hours before labor | Loss of mucus plug; pink-tinged discharge |
| Rupture of membranes | Before or during labor | Gush or trickle of clear fluid; confirm with speculum exam |
| Cervical changes | Progressive | Effacement (thinning) and dilation (opening) |
| Nesting | Days before | Burst of energy, desire to prepare |
| Contractions | Regular, increasing intensity | Distinguish from Braxton Hicks |
True Labor vs False Labor (Braxton Hicks)
| Feature | True Labor | Braxton Hicks (False Labor) |
|---|---|---|
| Contraction regularity | Regular intervals, becoming closer | Irregular, no pattern |
| Contraction duration | 30-70 seconds, lengthening | Variable, short |
| Contraction intensity | Increasing with time | Stable or changing |
| Effect of activity | Walking increases intensity | Walking may decrease |
| Effect of hydration | No effect | May decrease with hydration |
| Cervical change | Progressive dilation/effacement | No cervical change |
| Location of pain | Starts in back, radiates to abdomen | Typically in lower abdomen |
Stage 1: Dilation
Phases of First Stage
| Phase | Dilation | Duration (Primip) | Duration (Multip) | Contraction Pattern |
|---|---|---|---|---|
| Latent | 0-6 cm | 6-18 hours | 4-12 hours | Irregular to regular; mild; every 5-10 min |
| Active | 6-10 cm | 4-8 hours | 2-5 hours | Regular; moderate-strong; every 2-5 min |
| Transition | 8-10 cm | 30 min - 2 hours | 5-30 min | Strong; every 2-3 min; may have urge to push |
Management of First Stage
| Aspect | Intervention |
|---|---|
| Monitoring | Fetal heart rate (intermittent or continuous), contraction pattern, maternal vitals, cervical exams |
| Pain management | See pain management section below |
| Positioning | Encourage mobility in latent phase; upright positions in active phase |
| Hydration/nutrition | Clear liquids in early labor; IV fluids if prolonged |
| Bladder care | Encourage voiding q2h; catheter if unable |
| Rupture of membranes | Amniotomy may be performed to augment labor |
| Support | Continuous labor support (doula) reduces cesarean rate by 25% |
| Progress | Active phase dilation: 1 cm/hour (primip) or 1.2+ cm/hour (multip) |
| Arrest | No cervical change for 4+ hours with adequate contractions, or 6+ hours with inadequate |
Stage 2: Pushing
Phase Characteristics
| Phase | Duration (Primip) | Duration (Multip) | Description |
|---|---|---|---|
| Passive descent | Varies | Varies | Fetal head descends without maternal pushing effort |
| Active pushing | Up to 3 hours (with epidural); up to 2 hours (without) | Up to 2 hours (with epidural); up to 1 hour (without) | Maternal pushing with contractions |
Pushing Techniques
| Aspect | Technique |
|---|---|
| Timing | Push during contractions or when urge is felt |
| Position | Upright (squatting, kneeling, sitting on birth stool, hands-and-knees) preferred; avoid prolonged supine |
| Technique | Closed glottis (Valsalva) or spontaneous (open glottis) pushing |
| Breathing | Hold breath for 6-8 seconds while pushing; avoid prolonged breath holding |
| Rest | Rest between contractions; partner/caregiver encouragement |
| Perineal support | Warm compresses, perineal massage, guided expulsion to reduce tearing |
Second Stage Arrest
| Situation | Duration | Intervention |
|---|---|---|
| Nulliparous, no epidural | >3 hours of active pushing | Consider operative vaginal delivery or cesarean |
| Nulliparous, with epidural | >4 hours of active pushing | Consider operative vaginal delivery or cesarean |
| Multiparous, no epidural | >2 hours of active pushing | Consider operative vaginal delivery or cesarean |
| Multiparous, with epidural | >3 hours of active pushing | Consider operative vaginal delivery or cesarean |
Fetal Station
| Station | Position Relative to Ischial Spines |
|---|---|
| -5 to -1 | Above ischial spines (not engaged) |
| 0 | At ischial spines (engaged) |
| +1 to +5 | Below ischial spines (descending) |
| +5 (crowning) | Visible at introitus |
Stage 3: Placental Delivery
| Aspect | Details |
|---|---|
| Duration | 5-30 minutes (prolonged if >30 minutes) |
| Signs of separation | Gush of blood, lengthening of cord, uterus becomes firm and globular |
| Delivery method | Spontaneous (gentle cord traction with uterine massage) |
| Active management | Oxytocin administration, controlled cord traction, uterine massage |
| Prolonged third stage | >30 minutes: manual removal of placenta, possible retained placenta |
| Blood loss | Normal: 500 mL (vaginal), 1000 mL (cesarean) |
Pain Management
Non-Pharmacological Pain Management
| Method | Mechanism | Evidence |
|---|---|---|
| Continuous labor support (doula) | Emotional support, advocacy, comfort measures | Reduces pain perception, reduces cesarean rate |
| Water immersion (bath/shower) | Warmth, buoyancy, relaxation | Effective for pain relief in latent/early active phase |
| Positioning (upright, mobility) | Gravity, pelvic opening | Reduces pain, shortens labor |
| Massage/counterpressure | Gate control, relaxation | Reduces pain, especially back pain |
| Heat (warm packs) and cold (ice packs) | Sensory modulation | Reduces focal pain |
| Acupressure/acupuncture | Endorphin release | Limited evidence during labor |
| TENS unit | Gate control, endorphins | Mild to moderate pain reduction |
| Aromatherapy | Relaxation | Limited evidence |
| Hypnosis | Altered pain perception | Reduces pain and anxiety |
| Breathing techniques | Relaxation, focus | Distraction, prevents hyperventilation |
Pharmacological Pain Management
| Method | Timing | Mechanism | Efficacy | Side Effects |
|---|---|---|---|---|
| Nitrous oxide (laughing gas) | Throughout labor | Anxiolytic, mild analgesia | Moderate | Nausea, dizziness, environmental exposure |
| Opioids (IV/IM): fentanyl, morphine, Nubain | Active phase | Mu-receptor agonist | Moderate | Maternal sedation, nausea; fetal respiratory depression (Nubain) |
| Epidural analgesia | Active phase (or earlier) | Local anesthetic + opioid in epidural space | Excellent | Hypotension, prolonged second stage (by ~1 hr), fever, urinary retention |
| Combined spinal-epidural (CSE) | Active phase | Spinal + epidural | Excellent | Faster onset; may be more effective |
| Pudendal block | Second stage | Local anesthetic to pudendal nerve | Good | For operative vaginal delivery |
| Paracervical block | Latent-active phase | Local anesthetic to cervix | Good | Fetal bradycardia risk (rare) |
Epidural Details
| Aspect | Detail |
|---|---|
| Timing | Can be placed at any point in labor (no minimum dilation required) |
| Procedure | Catheter in epidural space (L3-4 or L2-3); test dose, then bolus + continuous infusion |
| Medications | Bupivacaine/ropivacaine + fentanyl/sufentanil |
| Effect | Pain relief (not complete anesthesia); preserves motor function with low concentrations |
| Walking epidural | Very low concentration allows ambulation (limited evidence for benefit) |
| Contraindications | Coagulopathy, infection at insertion site, hypovolemia, increased ICP patient refusal |
| Complications | Hypotension (1-5%), post-dural puncture headache (1% with 25g needle), nerve injury (rare), epidural hematoma/abscess (very rare) |
Cesarean Delivery
Indications
| Category | Common Indications |
|---|---|
| Fetal | Non-reassuring fetal status, malpresentation (breech, transverse), multiple gestation, macrosomia (>4500 g with diabetes, >5000 g without), congenital anomaly |
| Maternal | Prior cesarean (with contraindication to VBAC), placenta previa, active genital herpes, preeclampsia with severe features, maternal medical conditions |
| Labor-related | Arrest of dilation (active phase >4 hours without change), arrest of descent (second stage duration exceeded), failed induction, cord prolapse, uterine rupture |
| Placental | Placenta previa, placental abruption, vasa previa |
| Other | Previous adverse outcome, patient request (controversial) |
Cesarean Rate
| Population | Rate |
|---|---|
| United States (2022) | 32.1% |
| Nulliparous, term, singleton, vertex (NTSV) | 26.3% |
| WHO target | 10-15% |
| Range across countries | 5-50%+ |
Recovery
| Day | Milestone |
|---|---|
| Day 0 | Recovery room; monitoring of vitals, bleeding, pain control; IV fluids |
| Day 1 | Ambulate with assistance, clear to regular diet, foley removed, IV pain -> oral pain |
| Day 2 | Increase ambulation, shower, wound check, encourage bowel movement |
| Day 3-4 | Consider discharge if stable, afebrile, adequate pain control, voiding, passing gas |
| Week 1-2 | Limit lifting (<10 lb), no driving while on narcotics, wound care, incision check |
| Week 6 | Full recovery usually; pelvic rest until cleared; resume exercise gradually |
Vaginal Birth After Cesarean (VBAC)
| Factor | Favorable for VBAC | Less Favorable |
|---|---|---|
| Prior incision | Low transverse (most common) | Classical, T-incision, inverted T |
| Number of prior cesareans | 1 | 2+ (increased risk) |
| Prior vaginal birth | Yes | No |
| Reason for prior cesarean | Fetal malpresentation | Failure to progress (low success) |
| Interdelivery interval | >18 months | <18 months |
| Estimated success rate | 60-80% | Variable |
Uterine Rupture Risk
| Scenario | Risk |
|---|---|
| Spontaneous labor, no prior cesarean | 1 in 10,000 |
| Trial of labor after 1 cesarean (TOLAC) | 0.5-0.9% |
| Trial of labor after 2+ cesareans | 1-2% |
| Induced/augmented labor with prior cesarean | 1-1.5% |
| Classical uterine incision | 2-9% |
Complications
| Complication | Risk Factors | Management |
|---|---|---|
| Postpartum hemorrhage (>500 mL vag, >1000 mL CS) | Uterine atony (most common), lacerations, retained placenta, coagulopathy | Uterine massage, oxytocin, methergine, carboprost, misoprostol, tamponade balloon, surgical interventions |
| Shoulder dystocia | Fetal macrosomia, diabetes, obesity, prolonged labor, operative delivery | McRoberts maneuver, suprapubic pressure, Woods screw, Rubin maneuver, Gaskin (hands and knees), Zavanelli (LAST RESORT) |
| Preeclampsia/eclampsia | Nulliparity, chronic hypertension, multiple gestation, obesity, prior preeclampsia | Magnesium sulfate for seizure prophylaxis, antihypertensives, delivery |
| Cord prolapse | Malpresentation, polyhydramnios, multiple gestation, premature rupture | Elevate presenting part, emergent cesarean |
| Uterine rupture | Prior cesarean, classical incision, trauma, excessive oxytocin | Emergent cesarean, hysterectomy if needed |
| Amniotic fluid embolism | Rare (1 in 40,000), unpredictable | Cardiopulmonary support, DIC management |
| Perineal lacerations (3rd/4th degree) | First birth, operative delivery, large baby, episiotomy | Surgical repair, stool softeners, antibiotics |
| Chorioamnionitis | Prolonged ROM, prolonged labor, multiple cervical exams | IV antibiotics during labor |