12.1 GER, Vomiting & Infant Feeding Intolerance

Gastroenterology is clinical category #5 on the CPNP-PC outline. Items sit in Assessment (Domain II) and primary-care management (Domain III) and follow NASPGHAN/AAP infant-reflux principles, not adult heartburn habits. The scoring skill is naming the right vomiting: a wet bib, a diseased esophagus, a cow’s-milk gut, or a surgical abdomen.

Quick Answer: Effortless spit-up in a thriving infant is physiologic GER. Treat the happy spitter with feeding changes, thickening, and upright time after feeds — not a routine PPI. GERD is GER plus poor weight gain, pain, esophagitis, or Sandifer. Bilious vomiting is an obstruction emergency. Projectile nonbilious vomiting at 2–8 weeks is pyloric stenosis until ultrasound and electrolytes say otherwise.

GER is not GERD

Gastroesophageal reflux (GER) is the passage of gastric contents into the esophagus, with or without visible regurgitation. In infants it is usually physiologic: the lower esophageal sphincter is immature, the liquid meal is large relative to gastric volume, and much of the day is spent recumbent. Effortless spit-up commonly peaks around 4 months and resolves in most infants by 12–18 months. A comfortable infant who soaks bibs and follows the growth curve is a happy spitter. That is GER, not a disease label that requires acid suppression.

GERD is GER that causes troublesome symptoms or complications. In primary care that means poor weight gain or feeding refusal, marked pain or arching with feeds, esophagitis (including hematemesis or occult blood), and Sandifer syndrome — dystonic back-arching and head turning that is mistaken for seizure. Unexplained crying in an otherwise well, growing infant is not automatic GERD and is not an indication for months of omeprazole.

Happy-spitter management (NASPGHAN/AAP)

Counsel before you prescribe. NASPGHAN and AAP teaching is conservative care for uncomplicated infant regurgitation.

1. Reassure with the growth chart. Show that weight-for-length is intact. Explain that spit-up is common, that most infants outgrow it, and that medication does not dry a bib.
2. Avoid overfeeding. Review actual volumes. Formula-fed infants are often offered more than gastric capacity. Use smaller, more frequent feeds, burp, and check nipple flow so the infant is not gulping air and volume together.
3. Thicken feeds when regurgitation is messy but the infant is well: commercially thickened (AR) formula or infant-cereal thickening consistent with product and age guidance. Thickening reduces visible regurgitation. It is not permission to ignore red flags.
4. Upright after feeds. Hold the infant upright about 20–30 minutes. Do not park a baby in a car seat on the floor as “reflux treatment” — the semisupine sit can worsen reflux. Sleep remains supine in a safe crib. Prone and side-sleeping reduce GER on physiology studies and increase SIDS; they are not GER therapy.
5. Avoid tobacco smoke exposure.
6. Do not start a PPI or H2 blocker for physiologic GER. Chronic acid suppression for a happy spitter is the classic CPNP-PC trap. It does not fix regurgitation volume, it adds infection and bone-health concerns with prolonged use, and it delays recognition of CMPA or obstruction.

A short trial of extensively hydrolyzed formula belongs in selected infants (below), not in every wet bib.

When it is GERD

Once growth falters, feeds are painful, Sandifer is present, or there is GI blood, you have left the happy-spitter algorithm.

• History: volume and force; color (bilious versus nonbilious versus blood); relation to feeds; wet diapers; stool blood or mucus; eczema; family atopy; BRUE/apnea; cough; medications already given.
• Exam: weight-for-length or BMI trend, hydration, abdominal distension or olive mass, stool or diaper blood, atopic signs, and a neurologic look if Sandifer is in the story so you do not miss true seizure.
• Older child and adolescent GERD: heartburn, regurgitation, dysphagia, epigastric pain. Address late large meals, acidic triggers, and obesity. A time-limited PPI trial is reasonable for typical symptoms, then wean. Dysphagia, odynophagia, food impaction, anemia, or failure to wean → pediatric GI, not years of open-ended omeprazole in primary care.

Acid suppression for proven GERD with esophagitis is appropriate after evaluation. Acid suppression for unexplained crying in a well, growing infant is not. If you start a short PPI trial in a child with true reflux disease, schedule the stop date when you write the first prescription.

Red flags that are not reflux

Pyloric stenosis is a pattern you should be able to recite without a reference card. Typical age is 2–8 weeks (peak about 3–6 weeks), more often a first-born male, with progressive, forceful, nonbilious vomiting, persistent hunger, and dehydration. A palpable olive in the epigastrium or right upper quadrant is classic when present; absence of an olive does not exclude the diagnosis. The metabolic signature is hypochloremic, hypokalemic metabolic alkalosis from loss of gastric hydrochloric acid plus secondary potassium and volume depletion. Pyloric ultrasound is the diagnostic test of choice in the primary-care-to-ED flow. Treatment is intravenous fluid and electrolyte correction, then pyloromyotomy — not a PPI, not a hydrolysate, not “follow the spit-up next week.”

Cow’s milk protein allergy versus GER

Non-IgE-mediated cow’s milk protein allergy (CMPA) mimics reflux: vomiting, fussiness, mucus or blood in the stool, eczema, and sometimes poor growth. Family atopy supports the hypothesis; it does not prove it. Lactose-free cow’s milk formula still contains cow protein and does not treat CMPA.

NASPGHAN-aligned primary-care move in a formula-fed infant with GERD symptoms plus atopic or colitis features, or GERD that fails conservative feeding care: a 2- to 4-week trial of extensively hydrolyzed formula (amino-acid formula if hydrolysate fails or if anaphylaxis-range IgE disease is in play). In a breastfed infant, a time-limited maternal cow’s milk elimination with dietetic support, then a rechallenge to confirm. If the trial fails, stop calling it milk allergy and look again — true GERD, obstruction, or metabolic disease. Do not stack a PPI plus three formula changes without a hypothesis.

IgE-mediated milk allergy is a different disease: urticaria, angioedema, or anaphylaxis with milk protein. That is allergy referral and epinephrine planning, not rice-cereal thickening.

Exam traps

• Chronic PPI for physiologic GER. Happy spitters get education, not omeprazole.
• Prone sleep “for reflux.” Supine sleep is non-negotiable.
• Missing bilious vomiting. Green emesis is not a titrate-the-PPI moment.
• Missing pyloric stenosis because the caregiver said “reflux.” Age, projectile pattern, olive, ultrasound, and alkalosis win.
• Calling CMPA “lactose intolerance” in a 6-week-old and switching to lactose-free cow’s milk formula.
• Metoclopramide for routine infant regurgitation — extrapyramidal risk, not first-line happy-spitter care.

The CPNP-PC is a primary-care exam. Distinguish GER from GERD, feed the happy spitter without acid drugs, trial hydrolysate in selected infants, ultrasound the pylorus, and never send bilious vomiting home.