Formula selection and preparation

Formula Fundamentals - 🍼 The First Sips

• Core Components: Most formulas are modified cow's milk-based, designed to mimic human milk.
  • Energy: Standard density is 20 kcal/30 mL (67 kcal/100 mL).
  • Carbohydrate: Lactose is the main sugar.
  • Fat: Vegetable oil blends provide essential fatty acids (Linoleic, ALA). Often fortified with DHA & ARA for neurodevelopment.
  • Micronutrients: Iron fortification is standard to prevent anemia.
• Preparation Protocol:
  • Strict hygiene is essential.
  • Standard Mix: 1 level scoop per 30 mL of previously boiled and cooled water.
  • ⚠️ Never alter the ratio; over-concentration can cause severe dehydration.

⭐ Humanized formulas are whey-dominant (Whey:Casein ratio of 60:40), mimicking mature breast milk, unlike casein-heavy cow's milk (20:80).

Specialized Feeds - 💊 Prescription Potions

• Preterm Formula: Higher calories (22-24 kcal/oz), ↑ protein, Ca, P, and MCT oil for catch-up growth.
• Lactose-Free Formula: For congenital or secondary lactose intolerance. Uses corn syrup solids instead of lactose.
• Soy-based Formula: Used for lactose intolerance & galactosemia. ⚠️ Avoid in preterm (<1800g) & for allergy prevention.
• Anti-Regurgitation (AR) Formula: Thickened with carob bean gum or rice starch for frequent spitting up (GER).
• Fat Malabsorption Formula: For conditions like cholestasis or short bowel syndrome. High in Medium-Chain Triglycerides (MCT).
• Inborn Errors of Metabolism (IEM): Disease-specific formulas, e.g., Phenylalanine-free for PKU.

⭐ For severe Cow's Milk Protein Allergy (CMPA) presentations like FPIES, anaphylaxis, or failure to thrive on eHF, Amino Acid-based Formula (AAF) is the first-line choice.

Preparation & Pitfalls - 🥣 Kitchen Chemistry

• Standard Dilution: 1 level scoop of powder for every 30 mL (1 oz) of water. Always add powder to water.

• Calculation: For desired volume (V) in mL, powder needed = $V \div 30$ scoops.

• Water Safety: Use water that has been boiled for 1 minute and cooled to lukewarm (~37°C). Do not use repeatedly boiled water or mineral water (↑Na+).

• ⚠️ Dilution Errors:

  • Over-dilution (too much water): ↓Calorie, ↓nutrient intake → Faltering growth, water intoxication.
  • Under-dilution (too little water): ↑Renal solute load → Hypernatremic dehydration, necrotizing enterocolitis risk.

⭐ High-Yield Pitfall: Avoid "top-up" feeds (adding extra powder to a feed to make baby sleep longer). This is a common cause of hypernatremia and renal injury.

High‑Yield Points - ⚡ Biggest Takeaways

• Standard term formulas are iron-fortified, cow's milk-based products providing 20 kcal/ounce.
• Preterm formulas are calorie-denser (22-24 kcal/ounce) with more protein and minerals for catch-up growth.
• The primary indication for soy formula is galactosemia, not routine colic or Cow's Milk Protein Allergy (CMPA).
• Extensively hydrolyzed formula is the first-line therapy for CMPA.
• Amino acid-based formulas are for severe CMPA or multiple food protein intolerances.
• Standard dilution is one level scoop per 30 ml of pre-boiled, cooled water.