Baby Formula & Infant Feeding Amount Calculator

Age	Feeds/day	ml/kg/day	oz/lb/day
Days 1–4	On demand	30–60	0.5–0.9
5 days–2 weeks	8	150	2.3
2 weeks–2 months	8	150	2.3
2–4 months	6	150	2.3
4–6 months	5	120	1.8
6–12 months	4	90	1.4

How to use this tool

Choose weeks for ages beyond day 4, or days to view the day 0–4 newborn guidance.
Enter your baby's current weight in kg or lb using the number field or slider.
Review the estimate, its daily planning cap status, and per-feed reference when available.

How this estimate works

For ages beyond day 4, the calculator selects an age band, multiplies that band's millilitres per kilogram per day by the baby's weight in kilograms, and divides the displayed daily amount by the band's reference number of feeds for a per-feed estimate. The age-band rate is an average; it cannot account for an individual baby's appetite, growth, medical history, or clinician's plan. A 4 kg baby at 4 weeks, for example, has an uncapped age-band estimate of 600 ml per day before any planning cap is applied.

The AAP says babies usually drink no more than about 32 fl oz (960 ml) of formula in 24 hours, while needs vary. The calculator applies that amount as a daily planning cap by default, and the checkbox can show the uncapped weight-based estimate for transparency. This is not a hard feeding limit: do not reduce feeds for a hungry baby solely because of the cap. Ask your pediatrician about consistently higher or lower needs. See the AAP formula amount and schedule guidance .

The first four days use a range rather than a single daily target. The Royal Children's Hospital lists 30–60 ml/kg/day for days 1–4 as approximate ward guidance and notes that needs vary with gestational age and illness; this calculator does not show a numeric estimate for day 0. The range is not a home feeding order or a bottle target. The AAP says to offer newborn formula on demand and that first-week feeds are usually about 1–2 oz (30–60 ml) per feed, so follow hunger cues and the baby's clinician-directed plan. Read the RCH neonatal ward guidance and the AAP feeding guidance for their original context.

Formula types: how to prepare each

Powder: The most economical option. Measured scoops are mixed with water. Follow the exact scoop-to-water ratio on the label; do not pack the scoop or add extra powder. Must be used within 1 hour if left at room temperature, or within 24 hours if refrigerated.
Liquid concentrate: A 1:1 mixture of concentrate and water. Easier to prepare consistently than powder. More expensive per ounce. Follow dilution instructions exactly.
Ready-to-feed (RTF): No mixing required - pour directly into a bottle. Most convenient and sterile, but the most expensive per ounce. Ideal for newborns, premature infants, or immunocompromised babies.

Age-based feeding guide

Age	Amount per feeding	Frequency	Daily total (approx.)
Newborn (first week)	1–2 oz (30–60 ml)	On demand	Varies
1–2 months	3–4 oz (90–120 ml)	About every 3–4 hours	Usually no more than about 32 oz/day
2–4 months	4–6 oz (120–180 ml)	Follow hunger cues	Usually no more than about 32 oz/day
4–6 months	4–6 oz (120–180 ml)	Follow hunger cues	Usually no more than about 32 oz/day
6–12 months (with solids)	6–8 oz (180–240 ml)	Follow hunger cues	Needs vary; ask your pediatrician

These are typical ranges, not a schedule. Every baby is different - always follow your pediatrician's guidance and feed on demand (when the baby shows hunger cues) rather than strictly by the clock. In its first-week guidance, the AAP notes that babies' feeding needs are individual and that consistently higher or lower intake should be discussed with a pediatrician.

Water quality for formula preparation

For infants under 2 months or immunocompromised babies, use pre-boiled and cooled water or commercially sterile bottled water. Boiling for 1 minute kills bacteria; let it cool to body temperature (≨37°C / 98.6°F) before mixing.

Well water and some tap water may contain high levels of nitrates, fluoride, or other minerals - consult your pediatrician or local water authority if you are unsure about your water source.

Hunger cues

Feed your baby on demand - when they show early hunger signals rather than waiting until they cry:

Rooting: Turning the head from side to side, opening the mouth, searching for a nipple.
Sucking motions: Sucking on hands, fingers, or tongue.
Fist to mouth: Repeatedly bringing hands to mouth.
Increased alertness: Eyes wide open, moving arms and legs more actively.
Crying: A late hunger cue - try to feed before this stage to avoid frustration during latching or bottle-taking.

Frequently asked questions

How much formula should a newborn drink?

Newborn needs vary. The AAP says babies in the first week usually take about 1–2 oz (30–60 ml) per feed and recommends feeding on demand. Days 1–4 volume guidance is only an approximate reference; day 0 has no numeric estimate here. Follow your pediatrician’s feeding plan.

When should I switch from formula to solid food?

Most paediatricians recommend introducing solids around 6 months. Formula remains an important nutrition source alongside solids until age 1. Always follow your doctor's guidance.

Are these amounts exact?

No. These are estimates based on age bands and weight. The 32 oz daily cap is a planning reference, not a hard limit; do not restrict a hungry baby solely because of it. Discuss consistently higher or lower needs with your pediatrician.