Formula feeding basics
Formula is straightforward once two things are locked in: mix it exactly as the label says, and respect the clock on a prepared bottle. Everything else — brand, temperature, bottle shape — is preference.
Mixing it right
- Wash hands and use a clean, dry bottle. Sterilise bottles for babies under three months, premature babies, or any baby with a weakened immune system.
- Water first, then powder. Adding powder first changes the final volume and the concentration.
- Use the scoop that came in the tin, levelled — never packed, never heaped, never a scoop from a different brand.
- Never dilute to stretch a tin and never over-concentrate to "fill" a baby. Both are genuinely dangerous.
- Swirl or roll rather than shaking hard to cut down on air bubbles.
How long it keeps
| State | Room temperature | Refrigerator |
|---|---|---|
| Freshly mixed, untouched | 2 hours | 24 hours |
| Bottle the baby has drunk from | 1 hour, then discard | Do not refrigerate |
| Ready-to-feed, opened container | 2 hours | 48 hours |
| Opened powder container | 1 month in a cool, dry cupboard | Do not refrigerate |
Prepared formula is never frozen. When in doubt about a bottle's age, tip it out — it is cheaper than a stomach bug.
Warming safely
Stand the bottle in warm water or use a bottle warmer. Never microwave — hot spots scald a mouth even when the bottle feels fine.
Combining with breast milk
Mix formula with water first, then add already-prepared breast milk. Track the split by volume so intake records stay accurate.
Switching brands
Any standard cow's-milk formula meets the same nutrition rules. Stools may change for a few days; only change type on your pediatrician's advice.
Night feeds without the fumbling
- Pre-measure powder into a dispenser and pre-fill bottles with water.
- Many babies happily take room-temperature formula — worth trying before you commit to warming at 3am.
- Make a fresh bottle rather than reheating a partly drunk one.
What to write down
Time, volume, and whether the bottle was formula, breast milk, or a blend. That is enough to answer every question at the next appointment and to spot a genuine change in appetite. For amounts by age see how much milk a baby needs, and for pacing the bottle itself see paced bottle feeding.
Log formula, breast milk or a blend
Nestli splits blended bottles by volume so daily totals stay honest.
Start tracking now!