Whether you’re formula feeding, giving expressed milk, or topping up alongside breastfeeding, the bottle is part of many families’ days — and there’s no scoreboard here. A fed baby and a coping parent is the whole goal. Getting it right is mostly a few safety habits and following your baby’s cues. Here’s how to make up a bottle safely, how much a newborn needs, and how to feed in a calm, baby-led way.
Making up a bottle safely
This is the part that really matters, because powdered formula isn’t sterile — so the preparation does the protecting:
| Step | Why it matters |
|---|---|
| Sterilise the bottle and teat | Newborn tummies are vulnerable in the early months |
| Use water boiled and cooled to no less than 70°C | Hot enough to kill bacteria that can live in the powder |
| Add the exact level scoops on the tin, water first | Too much strains the kidneys; too little underfeeds |
| Cool under a running tap, test on your inner wrist | It should feel body temperature, not hot |
| Make it fresh for each feed where you can | Made-up feeds breed bacteria as they sit |
| Throw away anything left after a feed | Saliva and warmth spoil it within an hour or two |
If you need to prepare ahead, cool it quickly and store it at the back of the fridge, not the door, and use it within 24 hours. Ready-made liquid formula is sterile until opened — handy when you’re out. Guidance varies a little by country, so check your local advice too.
How much, and how often
Newborns take small amounts often, then gradually more as they grow. A rough guide is around 150–200 ml per kilo of body weight across a day, split over the feeds — but treat it as a guide, not a target to hit. Babies, like adults, are hungrier some days than others, and bottle-fed babies cluster feed and go through growth spurts too.
Follow your baby’s cues: offer when they’re hungry, and let them stop when they turn away or slow down — don’t push the last few millilitres. Plenty of wet nappies and steady weight gain are your real reassurance that they’re getting enough.
Paced bottle feeding
Feed at your baby’s pace, not the bottle’s. It prevents overfeeding, cuts down on swallowed air, and — if you’re also breastfeeding — keeps the two easy to mix:
- Hold your baby fairly upright, head supported, never propped with a bottle and left.
- Keep the bottle roughly horizontal, with the teat just full, so milk only flows when they actively suck.
- Use a slow-flow teat, and let them pause and breathe; offer breaks, and switch sides halfway like they’d shift at the breast.
- Stop when they show they’re full — turning away, slowing, relaxing their hands — rather than aiming to empty the bottle.
Wind and spit-up
Bottle-fed babies swallow a fair bit of air, so wind them partway through and after. A little posset or spit-up afterwards is normal; large, forceful, or green vomiting is not, and is worth a call.
Combination feeding is completely fine
Breast, bottle, or both — it’s a practical choice, not a verdict on you. You can combine the two, and many families do. If you’re mixing with breastfeeding, paced feeding and a slow-flow teat help protect the latch and your supply. Whatever gets your baby fed and you through the day is the right call.
The short version
The bottle is a tool, not a test. Nail the safe-preparation habits, follow your baby rather than the numbers on the side, and feed at their pace. And because bottles make feeds easy to measure, they’re easy to share and track between two parents — who fed, how much, and when — so the load doesn’t all sit in one tired head.
This is general information, not medical advice. Formula preparation and feeding guidance vary by country and for premature or unwell babies — follow the advice of your own midwife or health service and the instructions on the formula tin.