Estimate how much breast milk or formula your baby needs each day and at each feeding — based on their weight and age, with typical feeding schedules built in.
Good to know: This is a general estimate, not medical advice. Every baby is different. Everything runs in your browser — nothing you enter is stored or sent anywhere.
Few questions worry new parents more than whether their baby is eating enough. The good news is that babies are remarkably good at telling you what they need — and there's a simple rule of thumb to sanity-check the amounts. For roughly the first six months, before solid foods enter the picture, a baby needs about 2.5 ounces of milk per pound of body weight over a 24-hour period. In metric terms that's close to 150 milliliters per kilogram per day. The same rule applies whether your baby drinks breast milk, formula, or a mix of both, because the two are similar in calories.
So a 10-pound baby needs somewhere around 25 ounces a day, and an 8-pound baby around 20 ounces. There's an important ceiling, though: intake tends to level off at roughly 32 ounces (about 950 mL) per day. Once a baby reaches that amount, piling on more milk usually isn't the answer. Their stomach and calorie needs have their limits, and after about six months the extra energy a growing baby needs starts coming from solid foods rather than from ever-larger bottles.
Divide the daily total by the number of feeds your baby takes and you get a rough per-feed amount. That's exactly what the calculator above does. But treat the result as a gentle reference point, not a target to hit at every feed. Appetites swing from feed to feed and day to day, just as ours do. A baby who takes a little less at one feed and more at the next is completely normal.
As babies grow, their stomachs get bigger, their feeds get larger, and the gaps between feeds stretch out. A newborn who nurses ten times a day may, a few months later, take fewer but bigger feeds. The table below shows typical patterns by age. Think of the "feeds per day" and "amount per feed" columns as common ranges, not rules — your baby may land above or below them and still be perfectly healthy.
| Age | Feeds per day | Typical amount per feed | Notes |
|---|---|---|---|
| Newborn (0–1 month) | 8–12 | ~2–3 oz per feed | Breastfeed on demand, roughly every 2–3 hours |
| 1–2 months | 7–9 | ~3–4 oz per feed | Feeds start to get a little bigger and more spaced out |
| 2–4 months | 6–8 | ~4–5 oz per feed | Many babies settle into a looser rhythm |
| 4–6 months | 5–6 | ~5–6 oz per feed | Milk is still the whole diet until solids begin |
| 6–9 months (solids starting) | 4–5 | ~6–8 oz per feed | Complementary foods added; milk remains primary |
| 9–12 months | 3–4 | ~7–8 oz per feed | Milk feeds plus about 3 meals of solids a day |
Notice how breastfed babies often feed a bit more frequently than formula-fed babies in the early weeks — breast milk digests quickly, so a nursing newborn may be hungry again in two hours. Formula digests more slowly, so bottle-fed babies sometimes stretch to longer gaps. Both patterns are healthy.
Whether you nurse, bottle-feed, or do both, the single most useful skill is learning to read your baby. Numbers on a calculator are averages; your baby's cues are the real thing. Early hunger signals are subtle and worth catching before your baby is crying, which is a late sign of hunger. Look for:
Fullness cues matter just as much, and they're how a baby "self-regulates" the amount they take. A baby who has had enough will often turn away from the breast or bottle, slow down or stop sucking, relax their hands and body, close their lips, or simply lose interest and drift off. When you see these signs, it's fine to stop — even if there's milk left in the bottle. Pushing a baby to finish a set number of ounces works against their natural ability to eat to appetite.
This is especially true for breastfed babies, who control the flow and volume themselves. You can't read ounces at the breast, and you don't need to. Trust the cues, watch the diapers and the growth, and let your baby lead. The guiding principle worth repeating: feed the baby, not the number.
Most babies are ready to begin solid foods around 6 months. The signs of readiness are developmental, not just about age: your baby can sit up with support, hold their head steady, has lost the reflex that pushes food out of the mouth, and shows real interest in what you're eating. Starting much before four months isn't recommended.
When solids do begin, remember that they are complementary at first. Throughout the entire first year, breast milk or formula remains your baby's main source of nutrition — solids are for practice, exploration, and gradually adding nutrients and calories. That's why the calculator keeps milk feeds central even in the 6–12 month bands. Introduce foods one at a time and watch for reactions.
Two safety points are worth committing to memory: never add extra water to stretch formula (always mix it exactly as the label directs, because diluting it can dangerously unbalance a baby's sodium and nutrition), and never give honey before 12 months, because it can cause infant botulism. Your pediatrician can guide you on which foods to introduce and when.
Every so often your baby will seem hungry all the time, feeding far more often than usual and fussing between feeds. This often coincides with a growth spurt — common times include around 2–3 weeks, 6 weeks, and 3 and 6 months, though every baby is different. During these stretches your baby is simply eating more to fuel a burst of growth, and for breastfeeding parents, the extra nursing is exactly what tells your body to make more milk. It usually settles within a few days.
You may also notice cluster feeding, where a baby bunches several feeds close together, often in the evening, sometimes with fussiness in between. It can be exhausting, but it's normal newborn behavior and not a sign that you're doing anything wrong or that your milk supply is failing. Follow your baby's lead, take care of yourself, and know that these intense periods pass.
A calculator can estimate typical amounts, but it can never tell you that your particular baby is thriving — only observation and your pediatrician can do that. Reach out to your pediatrician promptly if you notice any of the following:
Trust your instincts, too. If something feels off, you don't need to wait for a specific symptom on a list — call. Pediatric offices expect and welcome feeding questions, and it's always better to ask. Nothing here is a diagnosis or a substitute for your child's health provider; when in doubt, your pediatrician is the right person to guide you.
In the first few days a newborn's stomach is tiny, so they take only small amounts — often just a teaspoon or two per feed, working up to about 1.5–3 oz (45–90 mL) per feeding by the end of the first week. From then through about 6 months, a common rule of thumb is roughly 2.5 oz of milk per pound of body weight over 24 hours (about 150 mL per kg per day), up to a practical ceiling of around 32 oz (950 mL) a day. Breastfed newborns usually nurse 8–12 times in 24 hours on demand. These are averages — feed your baby when they show hunger cues rather than watching the clock or the ounce marks.
Because you can't see how many ounces a breastfed baby takes, watch what comes out and how they grow instead. In the early weeks, expect at least 6 wet diapers a day once your milk is in, regular stools, steady weight gain after the normal initial dip, and a baby who seems satisfied and relaxed after most feeds. Your pediatrician tracks weight at well visits. If you're worried about any of these signs, call your pediatrician or a lactation consultant — this calculator estimates typical intake but can't confirm your individual baby is getting enough.
For the first 6 months, formula intake follows the same rule of thumb as breast milk: about 2.5 oz per pound of body weight per 24 hours, up to roughly 32 oz (950 mL) a day. An 8-pound baby lands near 20 oz a day; a 12-pound baby is near the 30 oz range. Divide that by the number of feeds for your baby's age to estimate each bottle. Never stretch formula further by adding extra water — always mix it exactly as the label directs.
Newborns typically feed every 2–3 hours, which works out to 8–12 times a day. As babies grow, feeds become larger and less frequent: around 7–9 times a day at 1–2 months, 6–8 times at 2–4 months, and fewer still as solids begin near 6 months. Formula-fed babies often go a little longer between feeds than breastfed babies because formula digests more slowly. Follow your baby's hunger cues rather than a fixed schedule, especially in the early months.
Most babies are ready to start solid foods around 6 months, once they can sit with support, hold their head steady, and show interest in food. Solids are complementary at first — breast milk or formula remains your baby's main source of nutrition throughout the first year. Introduce single-ingredient foods and watch for allergies. Do not give honey before 12 months, as it can cause infant botulism. Talk with your pediatrician about timing and how to start.