Group B Strep (GBS) in Newborns
Content reviewed against published CDC, AAP, ACOG, NIH guidelines
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Group B Streptococcus (GBS, Streptococcus agalactiae) is a leading cause of serious bacterial infection in newborns. Approximately 25% of pregnant women carry GBS in the vaginal or rectal area without symptoms. During birth, bacteria can be transmitted to the baby, causing early-onset disease (within the first 7 days of life, usually within 24-48 hours) or late-onset disease (7 days to 3 months of age). GBS can cause sepsis, pneumonia, and meningitis. Universal maternal screening and intrapartum antibiotic prophylaxis have dramatically reduced early-onset disease.
Key takeaways
- Group B Streptococcus (GBS, Streptococcus agalactiae) is a leading cause of serious bacterial infection in newborns.
- Duration: Hospital stay for GBS sepsis typically 10-14 days for IV antibiotic completion. Meningitis requires 14-21 days of IV antibiotics and longer hospitalization. Full recovery from uncomplicated bacteremia is expected within 2-3 weeks. Complications from meningitis may require months to years of rehabilitation.
- Go to ER if: Any fever in a baby under 28 days old — this is always an emergency
- No vaccine currently available
Symptoms
How It Presents by Age
0-24 hours (early-onset)
Most common presentation of early-onset GBS. Signs often appear within hours of birth: respiratory distress, apnea, tachycardia, temperature instability, and poor tone. Frequently presents as sepsis or pneumonia. Accounts for approximately 50% of neonatal GBS disease.
Risk level: Very high — case fatality rate 2-3% in term infants, up to 20-30% in preterm infants
1-7 days (early-onset)
Continued risk period for early-onset disease. Signs include worsening respiratory status, feeding difficulties, lethargy, and hemodynamic instability. Bloodstream infection is the most common presentation (approximately 80%).
Risk level: Very high
7 days - 1 month (late-onset)
Late-onset GBS disease typically presents with bacteremia (65%), meningitis (25-30%), or focal infections (bone, joint). Irritability, fever, poor feeding, and lethargy are common. Meningitis is more common in late-onset than early-onset disease.
Risk level: High — meningitis risk is significant
1-3 months (late-onset)
Late-onset GBS can still occur up to 3 months. Fever, irritability, poor feeding, and signs of meningitis (bulging fontanelle, seizures) may be present. Bacteremia without a focus is also common. Some cases present with cellulitis-adenitis syndrome.
Risk level: High
Treatment
IV antibiotics (empiric)
Ampicillin plus gentamicin is the standard empiric regimen for suspected neonatal sepsis including GBS. Treatment is started immediately when infection is suspected, before culture results are available.
Targeted antibiotic therapy
Once GBS is confirmed by culture, penicillin G is the drug of choice. Ampicillin is an acceptable alternative. Duration is 10 days for bacteremia without meningitis, 14-21 days for meningitis.
Supportive NICU care
Respiratory support (supplemental oxygen, CPAP, or mechanical ventilation), IV fluids, temperature regulation, blood pressure support, and close monitoring of vital signs and laboratory values.
Seizure management
Anticonvulsant medications (phenobarbital is first-line in neonates) if seizures occur, particularly in cases complicated by meningitis.
Repeat lumbar puncture
For GBS meningitis, repeat lumbar puncture at 24-48 hours to document CSF sterilization is recommended. Persistent positive CSF cultures may require extended antibiotic therapy or investigation for complications.
Home Care
- There are NO home remedies for GBS disease in newborns — this is a medical emergency requiring hospitalization
- If your newborn shows any signs of illness, seek immediate medical care
- After hospital discharge, follow all medication and follow-up instructions
- Watch for any return of symptoms such as fever, poor feeding, or lethargy
- Keep all follow-up appointments, especially hearing tests if meningitis occurred
- For GBS-positive mothers: ensure you receive intrapartum antibiotics during labor as prescribed
When to Worry
Go to the ER if:
- Any fever in a baby under 28 days old — this is always an emergency
- Baby is limp, floppy, or difficult to wake
- Breathing difficulties — grunting, nasal flaring, chest retractions, or pauses in breathing
- Baby refuses to feed and has decreased wet diapers
- Skin is mottled, pale, bluish, or gray
- Seizure-like movements (jerking, stiffening, eye rolling)
- Bulging fontanelle (soft spot) on baby's head
- Baby is inconsolable with a high-pitched cry
Call your doctor if:
- Any fever (>100.4F/38C) or hypothermia (<97.7F/36.5C) in a newborn
- Decreased feeding — baby taking less than half of normal feeds
- Baby is less active or more sleepy than usual
- Jaundice that appears worse or develops after initial improvement
- Any concern that the newborn is "not acting right"
Keep an eye on:
- Newborn is not feeding well or seems excessively sleepy
- Baby feels hot or unusually cold to touch
- Breathing seems fast, noisy, or labored
- Baby is unusually floppy or limp
- Baby is more irritable than normal and difficult to console
- Skin appears pale, mottled, or bluish
Prevention
- Universal GBS screening of all pregnant women at 36-37 weeks gestation with vaginal-rectal culture
- Intrapartum antibiotic prophylaxis (IAP) — IV penicillin or ampicillin given during labor to GBS-positive mothers
- IAP given at least 4 hours before delivery for maximum effectiveness
- GBS-positive mothers with penicillin allergy receive alternative antibiotics (cefazolin, clindamycin, or vancomycin)
- IAP is also indicated for: prior infant with GBS disease, GBS bacteriuria during current pregnancy, unknown GBS status with risk factors (preterm labor, prolonged membrane rupture >18 hours, maternal fever)
- No vaccine is currently available, though GBS vaccines are in clinical development
- Good hand hygiene in NICU settings to prevent late-onset disease
Contagion & Incubation
Incubation
Early-onset disease: symptoms typically appear within 12-48 hours of birth, nearly always within the first 7 days. Late-onset disease: symptoms appear between 7 days and 3 months of age, with a median onset around 5 weeks of age.
Contagious for
GBS is not spread through casual contact. Transmission to the newborn occurs during labor and delivery (early-onset) or through close contact postnatally (late-onset). Hospital-acquired transmission is possible in NICUs.
Duration
Hospital stay for GBS sepsis typically 10-14 days for IV antibiotic completion. Meningitis requires 14-21 days of IV antibiotics and longer hospitalization. Full recovery from uncomplicated bacteremia is expected within 2-3 weeks. Complications from meningitis may require months to years of rehabilitation.
Frequently asked questions
How long does group b strep (gbs) in newborns last?
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Sources
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources
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Bottom line
Group B Strep (GBS) in Newborns is treatable with appropriate medical care. Seek emergency care if any fever in a baby under 28 days old — this is always an emergency.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.