If you're breastfeeding but thinking about adding a bottle — whether that's expressed milk or formula — you're considering combination feeding. Also called mixed feeding, combo feeding or top-up feeding, it simply means giving your baby both breast and bottle. It's a flexible, common choice for Australian families, and done thoughtfully it can give you the best of both worlds. Here's how to make it work.

What is combination feeding?

Combination feeding means your baby gets breast milk from the breast as well as milk from a bottle — the bottle can hold your own expressed breast milk, infant formula, or a mix of both. The Australian Breastfeeding Association notes that terms like "mixed feeding", "supplementing" and "topping up" all describe the same thing. There's no single right way to do it; the balance that suits your family is the right one.

Why parents choose to combine breast and bottle

The reasons are personal and varied. Some mums combo feed because of concerns about supply or their baby's weight gain, some are returning to work or study, some want a partner to share feeds, and some simply want a little more flexibility and rest. Whatever your reason, combination feeding is a legitimate way to keep breastfeeding in your baby's life while fitting feeding around real life.

Will combination feeding affect my milk supply?

It can, so it's worth understanding the mechanics. Breast milk works on supply and demand — the more often milk is removed from the breast, the more your body makes. Every time a bottle replaces a breastfeed, your breasts get less stimulation, which can gradually lower supply. To protect your milk while combo feeding:

• Breastfeed first when you can, offering both sides before any top-up.
• Introduce bottles gradually rather than all at once.
• Express a little when you regularly miss a breastfeed (for example at work) to keep up demand.
• Keep plenty of skin-to-skin time and night feeds, which are great for supply.

For more, see our guide on how to increase breast milk supply naturally.

When can I start combination feeding?

If breastfeeding is going well and there's no medical reason to supplement sooner, it's generally suggested to wait until breastfeeding is well established — often around 4 to 6 weeks — before regularly introducing a bottle. This gives your supply time to settle and reduces the chance of nipple confusion. That said, every situation is different; if your baby needs supplementing earlier for medical or weight reasons, your midwife, GP or child health nurse will guide you. The Raising Children Network has helpful, Australian-specific information on timing.

How to introduce a bottle to a breastfed baby

Bottle refusal is common at first, so be patient. A few things that help:

• Offer the first bottle when your baby is calm and somewhere between hungry and full — not so hungry they're upset, not so full they're uninterested.
• Ask your partner or another carer to offer it, as babies often associate you with the breast.
• Choose a slow-flow teat that mimics breastfeeding, and let your baby draw the teat in rather than pushing it.
• Try "paced bottle feeding" — holding your baby more upright and the bottle more horizontal — so they control the pace, just like at the breast.

If your baby is firmly refusing, our guide on how to get your baby to take a bottle has more troubleshooting tips.

Warm every bottle to a safe, even temperature

Whether it's expressed milk or formula, warm it gently — never in the microwave, which causes dangerous hot spots. The Cherub Baby 'Click n Go' Travel Bottle Warmer brings a bottle to a safe, consistent temperature at home or on the go, which is especially handy when a partner is doing the feed. Shop bottle warmers →

Combining breast milk and formula

You can feed expressed breast milk and formula separately, or combine them — but prepare formula correctly first (boiled water cooled to the right temperature, exact measurements) before adding expressed breast milk, never the other way around. Don't add fresh formula to a bottle of breast milk your baby has already started, and follow the same hygiene and storage rules you'd use for each. Our breast milk storage guidelines and how to warm breast milk safely articles cover the details.

Keep expressed milk organised

If you're expressing for some feeds, a good storage system saves stress. Our Reusable Pouch & Breast Milk Bag Freezer Organiser keeps stored milk dated and easy to rotate. Explore our feeding gift packs →

Combination feeding and going back to work

Many Australian mums move to combination feeding around the time they return to work or study — breastfeeding when together and offering bottles when apart. Expressing during the day helps protect your supply and provides milk for the next day's bottles. Our guide on going back to work while breastfeeding in Australia walks through expressing at work, storage and your rights.

When to get support

If you're worried about your supply, your baby's weight, painful breasts, or you're feeling stressed about feeding, reach out early. The Australian Breastfeeding Association's National Breastfeeding Helpline (1800 686 268) offers free, qualified support, and Pregnancy, Birth and Baby (1800 882 436) and your child health nurse are there to help too. There's no "perfect" way to feed — a fed, thriving baby and a supported mum is the goal.

Frequently asked questions

What exactly is combination feeding?

It's giving your baby both breast and bottle. The bottle can contain your expressed breast milk, infant formula, or a combination. It's also called mixed feeding, combo feeding or topping up, and it's a common, flexible choice for many Australian families.

Will combination feeding reduce my milk supply?

It can, because milk supply depends on how often milk is removed from the breast. To protect your supply, breastfeed first before offering a top-up, introduce bottles gradually, express when you miss a feed, and keep up night feeds and skin-to-skin contact.

When should I start combination feeding?

If there's no medical reason to start sooner, it's often suggested to wait until breastfeeding is well established — around 4 to 6 weeks. If your baby needs supplementing earlier, your midwife, GP or child health nurse will guide you.

How do I get my breastfed baby to take a bottle?

Offer the bottle when your baby is calm and only mildly hungry, ask someone other than you to give it, use a slow-flow teat, and try paced bottle feeding so your baby controls the flow. Stay patient — it can take a few tries.

Can I mix breast milk and formula in the same bottle?

You can, but always prepare the formula correctly with cooled boiled water first, then add expressed breast milk — never add formula powder straight to breast milk. Follow safe hygiene and storage rules, and don't reuse a bottle your baby has already drunk from.

Is combination feeding bad for my baby?

No. Your baby still benefits from your breast milk, and combination feeding is a recognised, safe way to feed. Many families use it happily for months. Do what keeps your baby nourished and works for your wellbeing.

This article offers general information for Australian families and isn't a substitute for personalised advice. For support with your own situation, contact your child health nurse, GP or the Australian Breastfeeding Association.