5.3 Infant Illness, Reflux, and Allergy

Reflux: Normal Spitting vs. GERD

Gastroesophageal reflux (GER) — the backflow of stomach contents into the esophagus — is normal and common in infants because the lower esophageal sphincter is immature and the diet is all liquid. The classic "happy spitter" spits up after feeds, is comfortable, and grows well; this is physiologic and needs reassurance, not treatment. The IBCLC should explain that frequent spit-up alone is not a disease.

Gastroesophageal reflux disease (GERD) is the pathologic version: reflux accompanied by complications or distress — poor weight gain, pain/arching, feeding refusal, or respiratory symptoms. GERD warrants medical evaluation. The IBCLC's lactation-side support includes upright positioning during and after feeds, smaller/more frequent feeds, and assessing for oversupply/fast flow that can mimic or aggravate reflux. The IBCLC does not prescribe acid-suppressing medication and avoids recommending unnecessary weaning, since human milk empties faster from the stomach than formula.

Cow's-Milk Protein Allergy and Intolerance

A breastfed infant can react to cow's-milk protein (CMP) that passes into breast milk from the mother's diet. The most common breastfed presentation is allergic proctocolitis: blood-streaked, mucousy stools in an infant who is otherwise well and thriving (a cell-mediated reaction causing distal-bowel mucosal inflammation). Other signs can include eczema, fussiness, and vomiting.

The evidence-based first step (per the ABM protocol on allergic proctocolitis) is maternal elimination of cow's-milk protein — the mother removes all dairy for 2-4 weeks while continuing to breastfeed, then reintroduces to confirm. Eliminate one food group at a time and allow adequate time before judging effect. Counsel the mother on calcium/vitamin D and avoiding unnecessary broad elimination, because dairy also carries beneficial immune factors.

Importantly, FPIES and food protein-induced enteropathy rarely result from maternal-diet proteins, so maternal elimination is rarely needed for those — a common distractor. Breastfeeding is not stopped for CMP allergy.

Lactose Overload vs. Lactose Intolerance

These two are constantly confused, and the exam exploits it. Congenital lactose intolerance (absence of the lactase enzyme) is extremely rare and is a serious, distinct condition. What the IBCLC actually sees is functional lactose overload (also called foremilk-hindmilk imbalance), driven by oversupply and fast flow: the infant takes large volumes of lower-fat milk, the gut is overwhelmed by lactose, and the result is gassiness, green frothy explosive stools, and fussiness in a gaining-well infant.

The management is to slow and manage flow, not to wean from the breast: ensure full drainage of one breast before switching, use block feeding if oversupply is confirmed, address fast letdown with positioning. Do not advise switching to lactose-free formula for functional overload, and do not stop breastfeeding — the infant is not allergic to or intolerant of breast milk.

Hypoglycemia, Sepsis, Colic, and Congenital Conditions

Neonatal hypoglycemia: Certain newborns are at risk and need glucose screening — the classic at-risk groups are small-for-gestational-age (SGA), large-for-gestational-age (LGA), late-preterm, and the infant of a diabetic mother. Per AAP at-risk guidance, glucose is generally kept above ~40 mg/dL in the first 4 hours and above ~45 mg/dL from 4-24 hours, with screening before feeds. The IBCLC's contribution is to support early, frequent, effective feeding — colostrum and skin-to-skin help stabilize glucose — while the medical team manages monitoring and any IV glucose.

Sepsis red flags override everything: lethargy, poor feeding, temperature instability, no wet diapers (anuria), color change. These require urgent medical referral, never reassurance or a wait-and-see lactation plan.

Colic is defined by the "rule of 3s" (crying ≥3 hours/day, ≥3 days/week, in an otherwise healthy thriving infant). The IBCLC first rules out a feeding cause (oversupply/fast flow, latch, hunger) before attributing distress to colic, and avoids reflexively blaming the mother's milk.

Congenital conditions affecting feeding are tested as positioning/support problems, not contraindications:

• Down syndrome — low tone (hypotonia) and a relatively large tongue; use firm support, the Dancer hand position, and patience; breastfeeding is encouraged.
• Congenital heart disease — the infant tires quickly; use short, frequent feeds, monitor for fatigue/sweating, and protect supply with expression.
• Cleft lip and/or palate — a cleft lip alone often breastfeeds with the breast helping seal the gap; a cleft palate loses the ability to generate suction, so expressed milk via specialized cleft feeders is usually needed while supply is protected by pumping.

Worked Example: A 5-week-old, exclusively breastfed and gaining well, has streaks of blood and mucus in otherwise normal stools; the infant is content and feeding eagerly. The IBCLC recognizes the classic allergic proctocolitis picture (well, thriving infant + blood-streaked mucousy stool) rather than reflux or overload. Plan: continue breastfeeding, have the mother eliminate all cow's-milk protein for 2-4 weeks, support her with calcium/vitamin D guidance, and refer to the pediatrician to confirm the diagnosis and rule out other causes. The IBCLC does NOT recommend weaning or switching to formula — those would remove the protective benefits of human milk and are not the evidence-based response.