Enfamil A2 vs ByHeart Formula (2026): Which Formula Is Better?

🍼 Two Premium Paths to Gentler Digestion

Enfamil A2 (~$35/19.5 oz) and ByHeart (~$36/24 oz) are both positioned as premium alternatives to standard formula, and both claim gentler digestion. But they achieve this through entirely different mechanisms, and understanding the distinction helps you pick the right one.

Enfamil A2's approach: use milk exclusively from cows that produce only A2 beta-casein protein, eliminating A1 beta-casein, which some research links to digestive discomfort through the release of a peptide called BCM-7. The rest of the formula is fairly standard Enfamil formulation.

ByHeart's approach: use whole milk protein from standard cows (both A1 and A2) but process it as minimally as possible, pair it with organic lactose, and add a proprietary fat blend structured to improve absorption and reduce the calcium soaps that cause hard stools and gas. ByHeart's thesis is that the problem isn't A1 specifically — it's how formula is manufactured.

🧪 Ingredient Comparison

Both formulas use intact, non-hydrolyzed protein and lactose-based carbohydrate. The differences are in protein sourcing, fat blend technology, and overall formulation philosophy.

• Protein: Enfamil A2 uses nonfat milk and whey protein concentrate from A2-certified cows (no A1 beta-casein). ByHeart uses whole milk protein from standard cows (both A1 and A2 beta-casein present) with minimal processing to preserve the protein's natural structure
• Carbohydrate: Both use lactose as the primary carbohydrate. ByHeart specifies organic lactose. Neither uses corn syrup solids
• Fat blend: A2 uses a standard Enfamil vegetable oil blend (palm olein, coconut, soy, high oleic sunflower). ByHeart uses a patented fat blend designed to produce a different crystalline structure in the gut, improving fat and calcium absorption and resulting in softer stools
• DHA/ARA: Both include DHA and ARA for brain and eye development. A2 highlights DHA levels specifically; ByHeart includes DHA sourced from algal oil
• HMO/Prebiotics: Neither formula includes 2'-FL HMO or added prebiotics
• Probiotics: Neither includes probiotic cultures
• Organic status: Neither is fully USDA Organic certified. ByHeart uses organic lactose and sources from grass-fed cows. A2 does not carry organic labeling

💰 Price and Value Comparison

Both formulas sit in the premium tier, priced similarly enough that cost alone shouldn't drive the decision.

• Enfamil A2: ~$35 for 19.5 oz (~$1.79/oz). Available at major retailers (Target, Walmart, Amazon). Powder form only. Can sometimes be found with Enfamil coupon programs
• ByHeart: ~$36 for 24 oz (~$1.50/oz). Sold through ByHeart's website, Target, and Amazon. Subscription discount available direct from ByHeart. Powder form only
• On a per-ounce basis, ByHeart is actually cheaper (~$1.50 vs ~$1.79/oz) despite the higher sticker price, because the tub is larger
• Monthly cost at full feeding volumes: Enfamil A2 ~$140-160/month; ByHeart ~$120-140/month. ByHeart's larger tub provides better value

🔍 When to Choose Enfamil A2

Enfamil A2 is the better choice when you specifically suspect A1 protein is behind your baby's digestive discomfort.

• Your baby is mildly fussy or gassy on standard formula, and you want to isolate whether A1 protein is the cause by removing it while keeping everything else similar
• Your family has a history of A1 dairy sensitivity (some adults who struggle with regular milk find they tolerate A2 milk well)
• You've already tried ByHeart or another intact-protein formula and symptoms persisted — trying A2-specific protein is a logical next step before moving to hydrolyzed formulas
• You prefer staying within the Enfamil brand ecosystem for consistency with your pediatrician's recommendations
• You want a targeted change (just removing A1) rather than a completely different formula philosophy

🔍 When to Choose ByHeart

ByHeart is the better choice when you want a holistically different approach to formula — minimal processing, breast milk-inspired fat structure, and organic lactose.

• You're choosing a formula proactively (new baby, supplementing breast milk) and want the best overall ingredient profile regardless of whether A2 specifically matters
• Stool quality is a concern — ByHeart's patented fat blend is specifically designed to reduce calcium soap formation, producing softer stools
• You prefer organic lactose and grass-fed sourcing as part of your family's overall food philosophy
• You want better per-ounce value — ByHeart is ~16% cheaper per ounce than A2
• You're less convinced by the A2-specific science and more interested in a formula that takes a "whole system" approach to gentle digestion through fat blend innovation
• You're transitioning from breast milk and want a formula designed to match breast milk's fat absorption profile

⚖️ Head-to-Head Summary

• Gentleness approach: A2 removes A1 protein specifically; ByHeart uses minimal processing + patented fat blend
• Protein source: A2 = A2-only cow's milk; ByHeart = standard whole cow's milk (A1+A2)
• Carbohydrate: Both use lactose (ByHeart specifies organic lactose). No corn syrup solids in either
• Fat technology: A2 = standard vegetable oil blend; ByHeart = patented structured fat for better absorption
• Price per oz: ByHeart ~$1.50/oz is cheaper than A2 ~$1.79/oz
• Organic positioning: ByHeart uses organic lactose/grass-fed sourcing; A2 does not
• Availability: A2 has broader retail shelf presence; ByHeart is more DTC/subscription oriented
• Taste: Both taste mild and similar since neither is hydrolyzed
• Not for CMPA: Neither is appropriate for cow's milk protein allergy

✅ The Bottom Line

These are two well-made premium formulas with different theories about what makes digestion gentler. Enfamil A2 bets on removing A1 beta-casein as the key to comfort. ByHeart bets on minimal processing and fat blend innovation as the path to breast milk-like digestion. Neither is clearly superior across the board.

If you have a specific reason to believe A1 protein is an issue (family history, reading about A2 milk benefits), Enfamil A2 directly addresses that. If you want the best overall ingredient quality, better per-ounce value, organic lactose, and a formula designed around fat absorption science, ByHeart edges ahead on paper.

For most parents choosing between these two without a strong A2-specific hypothesis, ByHeart offers more value per ounce and a more innovative formulation. But the real answer for your baby comes from trying one, watching the results, and adjusting. Both are safe, nutritionally complete, and a meaningful step up from standard formulas in their respective ways.