Age-by-age formula amounts, hunger and fullness cues, what overfeeding looks like, and how volumes change once solids begin.
Your baby has been fed 90 ml (3 oz) and is still opening their mouth like a small furious bird. Or you've offered 150 ml (5 oz) and they've taken 40 ml (1.5 oz) and gone to sleep. Working out how much formula a baby actually needs — as opposed to how much the tin suggests — is one of the more confusing parts of the first year.
The short version: volumes are guidelines, not targets. Hunger cues matter more than millilitres. Here is what the numbers actually mean at each age.
Age-by-age formula amounts
These figures come from the American Academy of Pediatrics (AAP) and are consistent with guidance used by NHS health visitors.1 They represent typical ranges — there is genuine variation between babies.
| Age | Per feed | Feeds per day | Notes |
|---|---|---|---|
| Birth–2 weeks | 60–90 ml (2–3 oz) | 8–12 | Stomach is marble-sized; feed on demand |
| 2 weeks–1 month | 90–120 ml (3–4 oz) | 8–10 | Volumes increase as stomach grows |
| 1–3 months | 120–150 ml (4–5 oz) | 6–8 | Feeding rhythm begins to emerge |
| 3–6 months | 150–180 ml (5–6 oz) | 5–6 | Longer stretches between feeds |
| 6–9 months | 180–210 ml (6–7 oz) | 4–5 | Solids begin at ~6 months; formula remains primary |
| 9–12 months | 180–210 ml (6–7 oz) | 3–4 | Solids increasing; formula still the nutrition backbone |
Maximum daily total: The Scientific Advisory Committee on Nutrition (SACN) recommends no more than 1,000 ml (1 litre) of formula per day as a routine upper limit.2 Above this, the protein and mineral load becomes unnecessarily high, and it can crowd out appetite for other foods once solids begin.
What each phase actually looks like
Birth to 2 weeks: Feeds are frequent and sometimes feel relentless. A newborn's stomach holds very little. The volume range is small, but the number of feeds is high. This is biologically normal. You are not doing anything wrong if your baby feeds every 90 minutes.
2 weeks to 3 months: This is the phase where most parents find a rhythm. Feeds become slightly more predictable, volumes increase gradually, and the total number of feeds per day decreases. If your baby is draining every bottle and still showing hunger cues, it is usually fine to increase each feed by 15–30 ml (0.5–1 oz) at a time.
3 to 6 months: A more settled phase for most formula-fed babies. The 3–6 month range is also when parents are most likely to interpret normal fussiness as hunger — this is the age of the "growth spurt" and the "wonder weeks," and more formula is not always the answer.
6 to 12 months: Solid foods start around 6 months (on NHS guidance, not before 17 weeks). As solids increase through 7–9 months, formula volumes may start to plateau or decrease slightly. Formula remains the primary source of nutrition until 12 months — solids at this stage are about exploration and texture, not calorie replacement.2
Hunger cues vs clock-watching
Feeding on demand — responding to hunger cues rather than a fixed schedule — works well for most formula-fed babies, and results in better self-regulation of intake than timed feeding.
Early hunger cues (respond to these):
- Rooting (turning head, opening mouth)
- Sucking on fist or fingers
- Increased alertness or activity
Late hunger cues (you probably missed the early ones):
- Crying
- Rigidity or arching
You can feed a baby showing late hunger cues; it is just harder because they are already upset. Crying is not a reliable guide to how hungry a baby is — they cry for many other reasons too.
Fullness cues (stop when you see these, even if the bottle isn't empty):
- Turning away from the teat
- Slowing or stopping sucking without re-engaging
- Relaxed hands (clenched fists are often a hunger signal)
- Falling asleep and staying asleep
- Pushing the bottle away
A baby who is full does not need to finish the bottle. Pressing on after fullness cues is associated with overfeeding and can undermine appetite self-regulation over time. The paced bottle feeding technique makes it easier for babies to signal fullness before a feed is over.
What overfeeding looks like
Overfeeding formula-fed babies is possible, though it is less common than many parents fear. Signs it might be happening:
- Spitting up frequently and in large volumes (beyond normal positing)
- Discomfort after feeds — drawing up legs, crying, obvious abdominal distension
- Weight gain tracking well above the 98th centile on the growth chart (though rapid weight gain is not automatically a problem in infancy)
- Consistently exceeding 1,000 ml/day
If you are concerned about overfeeding, paced bottle feeding and watching fullness cues are the first practical steps. Speak to your health visitor if you're unsure — weight checks can help put it in context.
When volumes start decreasing
After 6 months, as solid foods become established, you may notice your baby voluntarily taking slightly less formula at some feeds. This is normal. Do not try to push formula intake back up to its previous level if solids are going well and weight gain is steady.
Between 9 and 12 months, many babies settle into 3–4 formula feeds a day, with meals and snacks filling the rest. Formula is still the primary nutrition source — whole cow's milk as a main drink is introduced at 12 months, not before.2
When to call your pediatrician
Contact your GP or health visitor if:
- Your baby is consistently refusing feeds and not gaining weight — same-day call
- Your baby drops below birth weight after the first two weeks — same-day call
- Your baby shows no hunger cues and is difficult to rouse for feeds — same-day call (or 999 if seriously unresponsive)
- Your baby has not regained their birth weight by 2 weeks of age — routine GP or health visitor review
- You are consistently unable to get your baby to take more than 50% of their expected daily volume over several days — GP or health visitor review
- Weight gain has fallen off across two centile lines on the growth chart — GP review
Routine questions about volumes and scheduling can wait for a health visitor appointment.
Tracking feeds in PooPeeMilk
Logging each feed — volume offered, volume taken, and time — gives you a running picture of your baby's intake that is easy to share with a health visitor or GP if questions come up. It also makes it much easier to spot patterns: which feeds tend to be larger, whether intake has changed after a formula switch, and how daily totals shift as solids are introduced.
← Back to the complete guide: Formula feeding: the complete guide
Also in this cluster: How to prepare formula safely · Paced bottle feeding · Storing prepared formula
Sources
- American Academy of Pediatrics. Amount and Schedule of Formula Feedings. HealthyChildren.org. https://www.healthychildren.org/English/ages-stages/baby/feeding-nutrition/Pages/Amount-and-Schedule-of-Formula-Feedings.aspx
- Scientific Advisory Committee on Nutrition (SACN). Feeding in the First Year of Life. 2018. https://www.gov.uk/government/publications/feeding-in-the-first-year-of-life-sacn-report
Footnotes
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American Academy of Pediatrics. Amount and Schedule of Formula Feedings. HealthyChildren.org. https://www.healthychildren.org/English/ages-stages/baby/feeding-nutrition/Pages/Amount-and-Schedule-of-Formula-Feedings.aspx ↩
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Scientific Advisory Committee on Nutrition (SACN). Feeding in the First Year of Life. 2018. https://www.gov.uk/government/publications/feeding-in-the-first-year-of-life-sacn-report ↩ ↩2 ↩3