Baby Formula Calculator

The standard formula intake formula

Healthy full-term infants typically need 2.5 ounces of formula per pound of body weight per 24 hours, up to about 32 ounces per day. A 10-pound baby needs about 25 ounces daily. Most pediatricians cap intake at 32 oz/day even for larger babies after the first month.

By age and approximate amount per feeding

• 0-2 weeks: 1-3 oz per feeding, every 2-3 hours (8-12 feeds/day).
• 2-4 weeks: 2-4 oz per feeding, every 3-4 hours (7-9 feeds/day).
• 1-2 months: 4-5 oz per feeding, every 3-4 hours (6-8 feeds/day).
• 2-4 months: 4-6 oz per feeding, every 4 hours (5-7 feeds/day).
• 4-6 months: 6-8 oz per feeding, every 4-5 hours (4-6 feeds/day).
• 6-12 months: 6-8 oz per feeding, plus solids. Total formula drops to 24-30 oz/day.

Signs of overfeeding

Babies will eat more than they need if offered. Watch for:

• Excessive spitting up after most feeds (a little is normal — soaking 2+ burp cloths per feed is not).
• Gassy, fussy, arching back 30-60 minutes after a feed.
• Refusing the bottle or turning the head away — let them stop.
• Weight gain over 8 oz per week consistently past month 2.

Signs of underfeeding

• Fewer than 6 wet diapers per day past day 5 of life.
• Not regaining birth weight by 10-14 days.
• Lethargy, hard-to-wake feeds — could be dehydration. Call pediatrician.
• Crying within 30 minutes of finishing a bottle, every feed.

Mixing safety basics

• Wash hands and surfaces before preparing.
• Boil water for babies under 3 months, then cool to body temperature.
• Add water first, then powder — gives accurate concentration. Reverse causes errors.
• Use prepared formula within 1 hour at room temp or 24 hours refrigerated. Never refrigerate leftover formula a baby has drunk from.
• Don't dilute to stretch a tin. Diluted formula causes hyponatremia (low sodium) in infants — a medical emergency.

Formula types compared

• Standard cow's milk based (Similac Pro-Advance, Enfamil NeuroPro): First choice for most babies. Iron-fortified.
• Gentle / sensitive: Partially broken-down proteins. Try if standard causes gas or fussiness without other symptoms.
• Soy-based (Similac Soy Isomil, Enfamil ProSobee): For milk protein allergy or galactosemia. NOT for lactose intolerance — most lactose-intolerant babies tolerate standard formula fine.
• Hypoallergenic / hydrolyzed (Nutramigen, Alimentum): For confirmed milk protein allergy. Bitter taste; smell is strong. Prescription-style ($30+/can).
• Amino acid (EleCare, Neocate): For severe allergies. Usually pediatrician-directed.
• European brands (Holle, HiPP, Kendamil): Popular online but not FDA-registered. Generally safe; check importer credibility.

When to talk to your pediatrician

Any time intake drops by more than 30% for over 24 hours, weight loss past day 14, blood in stool, or persistent green/explosive stools. Don't switch formulas without their input — most "intolerance" symptoms resolve in 7-10 days on the original formula.