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Estimate how much prepared infant formula your baby may take per day (milliliters and US fluid ounces) and per feed, based on chronological age and how many bottles you offer in 24 hours. Wide teaching bands reflect real appetite variation—follow your pediatrician, growth charts, and hunger cues. For preemies, see corrected age.
Last updated: June 4, 2026
Use decimals for young infants (example: 0.25 ≈ 1 week). For prematurity, ask your clinician whether to use corrected age.
Estimated total prepared formula / 24 h
650–1000 ml
≈ 22–33.8 US fl oz (labels vary by region)
Per feed (÷ 8 feeds)
81–125 ml
≈ 2.7–4.2 US fl oz per feed
If you landed near the midpoint of the daily range (~825 ml/day), that would be about 150 ml/kg/day for a 5.5 kg baby—only a rough sanity check; clinicians use growth velocity, urine output, and exams—not one ratio.
~1 week · 10 feeds
325–585 ml/day
33–59 ml/feed
≈ 1.1–2 oz/feed
2 months · 8 feeds · 5.5 kg
650–1000 ml/day
81–125 ml/feed
≈ 22–33.8 oz/day total
4 months · 6 feeds
720–1100 ml/day
120–183 ml/feed
6 months · 5 feeds · 7.5 kg
680–1150 ml/day
136–230 ml/feed
Knot values used in the calculator; values between ages are linearly interpolated. Per-feed amounts depend on how many feeds you enter.
| Age | Typical daily prepared formula | Common feeds/day | Notes |
|---|---|---|---|
| ~2 weeks (0.13 mo) | 280 – 520 ml | 8–12 | Widest band—early intake often ramps over days |
| 2 weeks (0.5 mo) | 420 – 720 ml | 8–10 | Frequent small feeds common |
| 1 month | 550 – 900 ml | 7–10 | Growth spurts may temporarily raise intake |
| 2 months | 650 – 1,000 ml | 6–8 | Peak daily volume band for many formula-fed infants |
| 3 months | 700 – 1,050 ml | 6–8 | Some babies lengthen sleep stretches |
| 4 months | 720 – 1,100 ml | 5–7 | Watch readiness cues before early solids |
| 6 months | 680 – 1,150 ml | 5–6 | Complementary foods often begin; formula may plateau |
| 9 months | 550 – 1,000 ml | 4–5 | Solids contribute more calories |
| 12 months | 450 – 900 ml | 3–4 | Transition toward cup and family foods |
US fluid ounces (nutrition labels on US bottles):
fl oz = ml ÷ 29.57
Examples: 60 ml ≈ 2.0 oz · 120 ml ≈ 4.1 oz · 180 ml ≈ 6.1 oz · 240 ml ≈ 8.1 oz
| Situation | What to watch |
|---|---|
| Hungry / ready to feed | Rooting, hands to mouth, fussing before scheduled feed, shorter interval since last feed |
| Satisfied after feed | Relaxed hands, sleepy, turns away from nipple/bottle, predictable wet diapers |
| May need more volume or medical review | Poor weight gain, <6 wet diapers/day after day 5, lethargy, weak suck, persistent vomiting |
The calculator stores daily prepared-formula volume knots from ~2 weeks through 12 months and linearly interpolates between them for smooth age entry. It divides the daily band by your feed count for planning purposes—real babies cluster feeds unevenly. Optional weight triggers a conversational ml/kg/day comparison to the range midpoint, not a calorie prescription.
Calorie density changes, hydrolyzed or amino-acid formulas, breastmilk fortification, reflux medications, or NICU discharge protocols.
Energy needs for illness, fever, or catch-up growth after poor weight gain.
Not medical advice. Feeding plans belong to your pediatrician or lactation consultant. Seek urgent care for dehydration signs, bilious vomiting, or fever in young infants.
For new parents, doulas, and perinatal educators
Suggested hashtags: #InfantFeeding #Formula #Pediatrics #NewParents #Calculator