10.5 Birth, Perinatal & Surgical History
Key Takeaways
- Gestational age and birth-weight class (SGA/AGA/LGA; LBW/VLBW/ELBW) set chart selection, corrected age, and iron and vitamin D dosing for years afterward
- Nutrient consequences follow anatomy: duodenum drives iron/calcium/folate, distal ileum drives vitamin B12 and bile-salt recycling, and the ileocecal valve guards against small-bowel bacterial overgrowth
- A retained colon in continuity salvages energy as short-chain fatty acids and is one of the strongest predictors of weaning off parenteral nutrition
- In an infant with an ileostomy or short bowel, a spot urine sodium below about 10 mmol/L signals total-body sodium depletion and stalled growth even when serum sodium is normal
- Every nutrition note on a surgical child should record remnant bowel length, presence of the ileocecal valve, and whether the colon is in continuity
Reading the Birth History as a Nutrition Document
The CSP examination assumes that a pediatric specialist reads a birth history the way a cardiologist reads an electrocardiogram: not as background, but as data that changes the prescription. A single line - born at 26 weeks, 620 g, 94 days in the NICU, 61 days of parenteral nutrition, surgical necrotizing enterocolitis at day 18 - already tells you the growth chart to use, the iron dose, the risk of metabolic bone disease, the likelihood of oral aversion, and the probability of ongoing malabsorption.
Capture these elements systematically:
| Element | Why it changes nutrition care |
|---|---|
| Gestational age | Determines corrected age (used for weight, length, and head circumference to 24 months) and chart selection (Fenton in the NICU, WHO at corrected age after discharge) |
| Birth weight and size for gestational age | LBW <2,500 g, VLBW <1,500 g, ELBW <1,000 g; SGA <10th percentile. SGA plus preterm is the highest-risk combination and predicts both catch-up need and later cardiometabolic risk |
| Maternal history | Gestational or pregestational diabetes (LGA infant, neonatal hypoglycemia, later obesity risk); hypertension/preeclampsia (placental insufficiency, IUGR); substance exposure (neonatal opioid withdrawal raises energy needs and disrupts feeding); maternal bariatric surgery or veganism (infant B12 risk) |
| Delivery and immediate course | Cesarean birth is associated with delayed lactogenesis II; low Apgar scores and hypoxic-ischemic encephalopathy predict oral-motor dysfunction |
| NICU course | Days of ventilation (bronchopulmonary dysplasia), sepsis episodes, NEC, PN days (metabolic bone disease, cholestasis), and human milk exposure |
| Discharge status | Feeding regimen and caloric density, discharge weight and z-score, supplements ordered - the baseline against which post-discharge growth is judged |
Two history-taking traps recur. First, families report gestational age loosely ("a couple of months early"); confirm it in the record, because a 4-week error moves corrected age enough to change whether an infant looks like a faltering feeder or a normal grower. Second, birth weight is not the same as size for gestational age - a 2,100 g infant born at 34 weeks is appropriately grown, while a 2,100 g infant born at 40 weeks is severely growth-restricted, and their nutrition trajectories differ completely.
Surgical Anatomy Predicts Which Nutrient Fails First
When a child has had bowel surgery, the nutrition assessment is fundamentally an anatomy question. Absorption is regionally specialized, so the resected segment tells you the deficiency to expect and screen for.
| Segment lost | Absorptive role | Predicted consequence |
|---|---|---|
| Stomach (resection, bypass, chronic acid suppression) | Acid-dependent iron and B12 release, intrinsic factor | Iron and vitamin B12 deficiency; dumping after pyloroplasty or gastrojejunal feeding |
| Duodenum / proximal jejunum | Iron, calcium, folate, fat-soluble vitamins, most macronutrients | Iron and calcium deficiency; large-surface loss drives global malabsorption |
| Distal ileum (terminal 100 cm equivalent) | Vitamin B12 and bile-salt reabsorption | B12 deficiency requiring parenteral or high-dose replacement; bile-salt depletion causing fat and fat-soluble vitamin malabsorption; bile-salt diarrhea |
| Ileocecal valve | Barrier to colonic bacteria; slows transit | Small intestinal bacterial overgrowth (SIBO), faster transit, worse absorption, higher PN dependence |
| Colon | Water and sodium reclamation; short-chain fatty acid energy salvage from fermented carbohydrate and fiber | Large fluid and sodium losses; loss of a meaningful energy salvage pathway. A colon in continuity is one of the strongest positive predictors of achieving enteral autonomy |
Other operations carry their own signatures. Nissen fundoplication prevents emesis but produces gas bloat, retching, and dumping, and is a frequent reason a child tolerates blenderized or continuous feeds better than boluses. Esophageal atresia/tracheoesophageal fistula repair leaves dysmotility, strictures, and oral aversion. Hirschsprung pull-through carries an ongoing enterocolitis risk that presents as feeding intolerance. Cardiothoracic surgery near the thoracic duct causes chylothorax requiring a medium-chain triglyceride regimen. Adolescent metabolic and bariatric surgery commits the patient to lifelong iron, B12, folate, calcium, vitamin D, and thiamine surveillance.
Ostomies, Output, and the Urine Sodium Pearl
An ostomy converts a nutrition problem into a fluid-and-electrolyte problem. Stoma output above roughly 40-50 mL/kg/day signals that enteral advancement has outrun absorptive capacity. The high-yield specialist skill is recognizing sodium depletion: the small bowel effluent is sodium-rich, and an infant can be profoundly sodium-depleted with a normal serum sodium, because the kidney defends serum concentration by dumping potassium and conserving every available sodium ion.
The practical monitor is a spot urine sodium. A value below about 10 mmol/L indicates total-body sodium depletion; the usual target is to supplement enteral sodium (often sodium chloride, sometimes sodium bicarbonate if losing base) until urine sodium sits comfortably above 20-30 mmol/L. Sodium is a growth nutrient - depleted infants stop gaining weight and length despite adequate calories, and growth resumes when sodium is replaced. Zinc losses are also substantial in high-output stomas and warrant supplementation.
A 3-month-old had a resection of the terminal ileum and ileocecal valve after volvulus. Which two consequences should the dietitian anticipate and monitor for specifically?
A 5-month-old with a jejunostomy has high stoma output, flat weight gain for 3 weeks, and a serum sodium of 137 mEq/L. Spot urine sodium is 6 mmol/L. What is the best interpretation?
Two infants each weigh 2,100 g at birth. One was born at 34 weeks and one at 40 weeks. What does this comparison illustrate about the birth history?