Combination feeding — sometimes called "combo" or "mixed" feeding — simply means your baby gets both breast milk and bottle feeds. The bottle might hold expressed breast milk, formula, or a mix. Parents choose this for all sorts of reasons: returning to work, sharing night feeds, a slow weight gain, low supply worries, or simply wanting more flexibility. It's a completely valid way to feed your baby, and it doesn't have to be all-or-nothing.
Why families combo feed
There's no single "right" way to feed a baby. The WHO recommends exclusive breastfeeding for around the first six months where possible, but real life is rarely tidy. Combination feeding can be a sustainable middle path — one that keeps some of the benefits of breastfeeding while giving you rest, shared load, and breathing room.
Protecting your supply
Milk supply works on demand: the more milk removed, the more your body makes. When a bottle replaces a breastfeed, your breasts get the signal to make a little less. In the early weeks (roughly the first 4–6 weeks while supply is establishing), this matters most.
To keep supply steady:
- Breastfeed first where you can, then top up with a bottle if needed.
- Express when you skip a feed. If a bottle replaces a breastfeed, pump or hand-express around that time to keep the demand signal going.
- Don't drop feeds too fast. Phase out one breastfeed at a time over several days so your body adjusts comfortably and you avoid blocked ducts or mastitis.
- Prioritise the early-morning feed — prolactin (the milk-making hormone) tends to be highest overnight and at dawn.
Introducing the bottle
Some babies take a bottle straight away; others need patience. Try:
- Offering when baby is calm and just a little hungry — not screaming.
- Having someone other than the breastfeeding parent offer it (baby may "hold out" for the breast otherwise).
- Trying a slow-flow teat and warming the milk to body temperature.
- Different positions, teat shapes, or time of day if the first attempts don't land.
Use paced bottle feeding: hold baby fairly upright, keep the bottle close to horizontal, and let baby pause and breathe. This mimics the flow of the breast and helps prevent overfeeding.
Breast vs bottle at a glance
| Breast | Bottle | |
|---|---|---|
| Supply effect | Drives milk production | Can lower supply if it replaces a feed |
| Flexibility | Always available, no prep | Others can feed; needs prep and cleaning |
| Flow | Baby controls flow | Use paced feeding and slow-flow teat |
| Best for | Bonding, immunity, on-demand | Shared load, work, top-ups |
Flexible approaches that work
There's no single schedule. Common rhythms include:
- Breast by day, bottle at night (so a partner can take a night feed).
- One regular bottle a day to keep baby used to it.
- Top-up feeds after breastfeeding if weight gain is slow — ideally guided by your child-health nurse.
- Bottles only on workdays, breast on days off and overnight.
| Bottle contents | Good to know |
|---|---|
| Expressed breast milk | Follow safe storage and warming guidance; never re-freeze thawed milk |
| Formula | Make up fresh each feed; discard leftovers after a feed |
| Combination | Don't add formula powder directly to a bottle of breast milk — prepare formula separately first |
Storage and preparation times vary slightly by region, so check your local source (ABA and Raising Children Network in Australia; the AAP in the US).
Safety first
When to get support
Combo feeding is usually smooth, but reach out to your GP, child-health nurse, midwife, or a lactation consultant if:
- Your baby has fewer than 6 wet nappies a day, seems very sleepy, or isn't gaining weight.
- You notice signs of low supply, a blocked duct, or breast pain/redness (possible mastitis).
- Bottle refusal is causing you stress or you're unsure how much formula to offer.
You're not doing anything wrong by feeding both ways. Whatever keeps your baby fed and your family functioning is a good plan — and it can change as often as you need it to.