Mixed feeding (breast and bottle)

Mixed feeding — sometimes called combination feeding — means giving your baby both breastmilk and formula, or breast and bottle. Loads of families do it, for all sorts of reasons, and it can be a flexible middle path that keeps breastfeeding going while adding the practicality of the bottle. Here’s how to make it work.

Why families mix feed. Reasons are endless and all valid: topping up if supply is low or weight gain is slow, sharing feeds so someone else can help (and you can rest), returning to work or study, managing your mental health, feeding twins, or simply wanting the flexibility. Mixed feeding lets your baby keep getting breastmilk’s benefits while easing the relentlessness of exclusive breastfeeding.

How it affects your supply. Milk works on supply and demand, so every time a bottle replaces a breastfeed, your body gets less signal to make milk, and supply can gradually drop. That’s fine if it’s what you want, but if you’re keen to protect your breastmilk supply, the key is to keep stimulating the breast regularly — feed or express around the times you give a bottle rather than simply skipping.

Introducing a bottle. If your baby has been exclusively breastfed, it often helps to wait until breastfeeding is well established (commonly around 4–6 weeks) before introducing a bottle, so latch and supply are settled — though there are exceptions, especially if top-ups are needed medically. Some breastfed babies take a bottle easily; others resist at first. Trying when they’re calm (not starving), having someone other than you offer it, and experimenting with teats can all help.

Protecting breastfeeding if that’s your goal. To keep supply up: breastfeed first and top up with a bottle after where you can, express when you miss a feed, and try not to drop breastfeeds faster than you intend. Paced bottle feeding (see below) also helps your baby keep wanting the breast. A lactation consultant can help you find a pattern that protects supply while adding bottles.

Paced bottle feeding. Feeding the bottle slowly — holding your baby fairly upright, keeping the bottle more horizontal, and letting them pause — mimics the effort of breastfeeding, avoids overfeeding, and helps prevent your baby coming to prefer the faster flow of the bottle. It makes going back and forth between breast and bottle much smoother.

A few practicalities. Follow safe formula preparation and bottle hygiene every time (clean, sterilised equipment for young babies; correct water-to-powder ratio; fresh feeds). Expect your baby’s poos to change as formula is added — often firmer and stronger smelling. And know your supply may take a little while to adjust as the balance shifts.

Let go of any guilt. Mixed feeding is not “failing” at breastfeeding — it’s a legitimate, common way to feed that keeps many families breastfeeding for longer than they otherwise could, and keeps babies fed and parents sane. Any amount of breastmilk is valuable, and a fed baby with a well parent is the win.

Where to get support. If you’re mixed feeding to solve a problem (supply, weight, pain), or you want help keeping your supply up, your child health nurse, a lactation consultant, or the ABA helpline (1800 686 268) can help you find a rhythm that works. There’s no single right balance — only the one that suits your baby and your life.

It can change over time. The balance you strike now isn’t fixed — some families do more breast early and more bottle later, others the reverse, and some settle at a steady mix for months. You can adjust as your circumstances, your supply and your baby change, so treat it as something you shape as you go rather than a decision you’re locked into.

Mixed feeding is all about flexibility, so give yourself permission to shape it around your family. Keep the breast stimulated if you want to protect supply, pace the bottle, follow the formula safety basics, and adjust as you go. You’re feeding your baby well — in whatever combination works.