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Neonatal Sepsis

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In one line

·A newborn with an infection that can turn deadly fast because the baby's immune system is brand new and cannot fight germs yet.

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Normal physiology

·A newborn's immune system is brand new and still learning to recognize and fight germs. For the first weeks, the baby depends on antibodies passed from mom during pregnancy (mainly IgG antibodies that crossed the placenta) and on physical barriers like intact skin, mucous membranes in the nose and throat, and stomach acid to keep bacteria and viruses out.

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What goes wrong

·The baby's immune defenses are too weak or too slow to stop bacteria from multiplying and spreading into the blood. Early-onset sepsis (in the first 72 hours of life) usually comes from germs the baby picks up from mom's birth canal during delivery — most commonly Group B Streptococcus (GBS), E. coli, or Listeria. Late-onset sepsis (after 72 hours) comes from germs in the hospital environment or at home, such as coagulase-negative staph, Staphylococcus aureus (including MRSA), E. coli, Klebsiella, or Candida (a yeast). Once bacteria enter the blood, they release toxins that trigger a massive inflammatory response. The baby's blood vessels leak fluid, blood pressure drops, and organs (brain, lungs, kidneys, liver) do not get enough oxygen and nutrients. The infection can spread to the fluid around the brain and spinal cord (meningitis), the lungs (pneumonia), or the bones and joints.

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Hallmark signs

·Temperature instability — baby is too hot (fever over 100.4°F) or too cold (under 97.7°F)
·Poor feeding or won't suck
·Breathing fast (over 60 breaths per minute) or grunting with each breath
·Floppy or limp body (low muscle tone)
·Irritability or high-pitched cry
·Skin looks pale, mottled (blotchy), or has a blue-gray tint
·Vomiting or belly swelling
·Yellowing of the skin and eyes (Jaundice) (yellow skin and eyes) that appears in the first 24 hours or gets worse fast

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Red flags · escalate now

·Pauses in breathing (Apnea) (baby stops breathing for more than 20 seconds) or turning blue
·Shock signs: very fast or very slow heart rate, weak pulses, capillary refill over 3 seconds, blood pressure dropping
·Bulging fontanelle (the soft spot on top of the head pushes outward) or stiff neck — signs meningitis may be present
·Pinpoint bleeding spots (Petechiae) or purple bleeding blotches (purpura) (tiny red or purple dots or larger bruises on the skin that don't fade when you press them) — may mean bacteria are causing blood to clot in small vessels

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Workup

·Complete blood count (CBC) with differential
·C-reactive protein (CRP)
·Blood culture (aerobic and anaerobic bottles)
·Lumbar puncture (spinal tap) with cerebrospinal fluid (CSF) culture, cell count, protein, and glucose
·Procalcitonin (PCT)
·Blood glucose (fingerstick or lab)
·Chest X-ray
·Urine culture (if baby is over 72 hours old or late-onset sepsis)

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Treatment

·IV ampicillin + gentamicin (early-onset sepsis, under 72 hours) or IV vancomycin + gentamicin (late-onset sepsis, over 72 hours)
·IV fluids with dextrose (sugar), usually D10W (10% dextrose in water) at 60–80 mL/kg/day
·Supplemental oxygen or mechanical ventilation (CPAP, intubation with a ventilator)
·IV acyclovir (60 mg/kg/day divided every 8 hours) if herpes simplex virus (HSV) is suspected
·Fluid bolus (10–20 mL/kg normal saline IV push) and vasopressors (dopamine 5–20 mcg/kg/min or epinephrine) if blood pressure is low
·Lumbar puncture before or within 24–48 hours of starting antibiotics
·Narrow antibiotics once culture and sensitivity results return (antibiotic stewardship)

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NCLEX trap

·Start antibiotics right away when you suspect neonatal sepsis, even before lab results come back. Every hour you wait, bacteria multiply and the baby's organs get weaker. In sepsis, waiting kills.
·The fast breathing is a distress signal—the baby is struggling because bacteria are attacking the body. You must kill the bacteria with antibiotics AND support the breathing. Treating one without the other leaves the real problem untouched.
·Yellowing of the skin and eyes (Jaundice) in a sick-looking newborn can mean the liver is under attack from sepsis. Normal newborn yellowing of the skin and eyes doesn't make a baby floppy, feverish, or refuse to eat. Always ask: could this be infection?
·Neonatal sepsis needs two antibiotics working as a team—ampicillin plus gentamicin for early-onset (first week of life), or vancomycin plus gentamicin for late-onset (after the first week). One drug alone misses important bacteria like Group B Strep or resistant staph, and the baby can die.
·Looking better doesn't mean all the bacteria are dead. Neonatal sepsis needs seven to ten days of antibiotics if the infection is in the blood, or fourteen to twenty-one days if it reached the brain and spinal fluid. Stopping early lets hidden bacteria wake back up and attack again.
·Antibiotics kill the bacteria, but sepsis damages the whole body—blood pressure drops, blood sugar crashes, and breathing gets hard. The baby needs IV fluids to keep blood pressure up, IV sugar (dextrose) to fuel the brain, oxygen or breathing help, and sometimes medicines to squeeze blood vessels tighter. All of these must happen at the same time.

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