Formula Calculator: Weight×2.5oz Formula & Amount by Age

Wondering how much formula to feed your baby? While every baby's appetite is different, we've compiled age-specific guidelines based on World Health Organization(WHO) and American Academy of Pediatrics(AAP) recommendations. From basic formulas to reading your baby's hunger cues, here's everything you need to know.

Basic Formula Calculation

Method	Formula	Example
Standard Calculation	Weight (kg) × 150ml ÷ Number of feeds	5kg baby: 750ml ÷ 6 feeds = 125ml/feed
Daily Range	Weight (kg) × 120-180ml	5kg baby: 600-900ml/day

💡 This formula is just a guide! Every baby's needs are different, so prioritize your baby's hunger and fullness cues.

Formula Amount by Age

Newborn (0-2 weeks)

Factor	Recommendation
Per Feeding	30-60ml (1-2oz)
Frequency	8-12 times/day
Interval	2-3 hours
Daily Total	300-500ml

2 Weeks to 1 Month

Factor	Recommendation
Per Feeding	60-90ml (2-3oz)
Frequency	7-8 times/day
Interval	2.5-3 hours
Daily Total	450-700ml

1-2 Months

Factor	Recommendation
Per Feeding	90-120ml (3-4oz)
Frequency	6-8 times/day
Interval	3-3.5 hours
Daily Total	600-900ml

2-4 Months

Factor	Recommendation
Per Feeding	120-150ml (4-5oz)
Frequency	5-6 times/day
Interval	3.5-4 hours
Daily Total	700-900ml

4-6 Months

Factor	Recommendation
Per Feeding	150-180ml (5-6oz)
Frequency	5-6 times/day
Interval	4 hours
Daily Total	800-1000ml

6-12 Months (After Starting Solids)

Factor	Recommendation
Per Feeding	180-240ml (6-8oz)
Frequency	3-5 times/day
Interval	4-5 hours
Daily Total	600-900ml (combined with solids)

💡 After starting solids at 6 months, it's normal for formula intake to gradually decrease.

Signs Your Baby is Getting Enough

Signs of Adequate Feeding

1. Diaper changes: 6-8 wet diapers per day
2. Weight gain: 150-200g per week (until 4 months)
3. Alertness: Active and responsive when awake
4. Skin color: Healthy complexion
5. Post-feeding satisfaction: Appears content after feeding

Signs of Hunger

1. Rooting: Turning head and opening mouth
2. Hand to mouth: Bringing hands to mouth
3. Fussiness: Restless after feeding
4. Sucking motions: Sucking on fists or fingers

Signs of Fullness

1. Refusing nipple: Turning away or pushing bottle
2. Slowing down: Sucking slows or stops
3. Falling asleep: Drifts off peacefully during feeding
4. Relaxed body: Open hands and relaxed posture

Overfeeding and Underfeeding Warning Signs

Overfeeding Symptoms

Symptom	Description
Frequent spitting up	Large amounts after each feeding
Bloated belly	Firm, distended abdomen
Rapid weight gain	Significantly exceeding growth curve
Increased fussiness	Discomfort from gas or indigestion

Underfeeding Symptoms

Symptom	Description
Poor weight gain	No gain or loss over 2+ weeks
Fewer wet diapers	Less than 6 per day
Dark urine	Deep yellow or orange color
Lethargy	More sleepy and less responsive than usual

Practical Formula Feeding Tips

Preparing Formula Correctly

1. Water first: Add cooled boiled water first
2. Accurate measuring: Level off each scoop
3. Gentle mixing: Swirl gently to minimize air bubbles
4. Temperature check: Test on inner wrist (body temperature)

Feeding Position

1. 45-degree angle: Hold baby with upper body elevated
2. Bottle angle: Keep nipple filled with formula
3. Burp breaks: Burp every 60-90ml
4. Paced feeding: Take 15-20 minutes per feeding

💡 Fast feeding can cause baby to swallow air, leading to gas and discomfort.

Growth Spurts

Babies go through periods where they suddenly want to eat more.

Growth Spurt	Duration	Response
2-3 weeks	2-3 days	Feed on demand
6 weeks	2-3 days	Increase by 10-20ml per feeding
3 months	3-7 days	Adjust amount or frequency
6 months	3-7 days	Consider starting solids

Frequently Asked Questions

Q: Can I save leftover formula?

A: No. According to the American Academy of Pediatrics(AAP), formula that baby has drunk from should be discarded within 1 hour due to bacteria risk. Prepared but untouched formula can be refrigerated for up to 24 hours.

Q: Should I wake my baby every 3-4 hours to feed at night?

A: During the newborn period (first 2 weeks), wake baby if sleeping longer than 4 hours. After that, if weight gain is normal, you can feed on demand.

Q: Can I switch formula brands?

A: Yes, if needed. Consult your pediatrician first and transition gradually over 1-2 weeks.

Manage Formula Feeding with BebeSnap

If remembering formula amounts and times is challenging, BebeSnap can help.

• One-touch feeding logs: Auto-calculate amounts, times, and intervals
• Feeding pattern analysis: Daily/weekly feeding graphs
• Reminders: Next feeding time alerts
• Growth tracking: Correlate weight gain with feeding amounts
• AI health reports: Feeding pattern analysis and tips

👉 Learn more about BebeSnap Feeding Records

References:

• AAP - Amount and Schedule of Formula Feedings
• WHO - Infant Feeding Guidelines
• CDC - How Much and How Often to Feed