Formula Transitioning Guide

Formula transition can feel like a daunting process for a new parent, especially if their child has encountered some side-effects on their previous formula. Some babies readily accept any formula being offered, while others may refuse or take time to gradually switch across.

Below are our tips on introducing your little one to a different formula — whether you’re switching from cow’s milk to goat’s milk formula, moving between stages, or trying a different brand entirely.

Wanting to make the switch? 

We always recommend a more gradual approach to give little tummies time to adapt to any new changes. A sudden switch to another brand or formula type can lead to fussiness, feed refusal, and sometimes constipation.

Here’s how to do it step by step:

– **Start with one feed.**

Swap out one feed of your child’s current formula with one feed of Oli6®. After 1–3 days (or when you and your child feel comfortable), substitute an additional feed and repeat again after another few days until all feeds are Oli6®. Allow time for your little one to adjust.

– **Offer the new formula in the morning first.**

When introducing a new formula, we recommend offering the first bottle or cup of the new formula in the morning, when baby is particularly hungry. This can reduce the risk of potential fussiness in the evening and also enables parents to monitor for any changes during the day.

– **Don’t mix formulas in the same bottle.**

We recommend swapping out whole bottles and not mixing two different formulas together. This is because different formula brands and types have different mixing ratios and instructions. Some ingredients from different formulas may also not be compatible.

– **Keep other feeding factors consistent.**

Try to avoid changing any other things your little one is used to when feeding — such as the bottles and teats you’re using, and where you normally sit to feed your baby. Too many changes at once may cause confusion.

Transitioning formula example schedule (for a baby on 5 feeds per day):

See the Oli6 transition table image below. Please note this is a guide only — some children may need to transition more slowly, and the number of feeds per day will vary.

Common physical changes when transitioning formula:

Most of these changes are transient as your little one is swapping formulas, however we always recommend checking in with your health care professional if any changes raises concerns.

What you might notice:

• **Changes in bowel motions** — colour, frequency, odour and consistency
• **Changes in sleep and settling patterns**, especially if baby is taking different volumes than before
• **Different odour** — baby may smell different, and their breath may change.
• **Weight changes** — minor fluctuations can occur during a transition.
• **Rash** — if your baby develops a rash, seek medical attention promptly.

When to seek advice

Before switching formula, we recommend consulting your healthcare professional, particularly if your baby:

• Has a history of low birth weight or was born prematurely
• Has a diagnosed medical condition
• Has a known allergy or intolerance
• Is showing signs of distress, poor weight gain, or other concerning symptoms.

Your healthcare professional can advise on whether the formula you’re considering is a suitable choice for your baby’s specific nutritional needs.

Any questions? Please reach out to our customer service team customer.service@oli6.com.au 

**Any questions? Reach out to our customer service team at customer.service@oli6.com.au**

_\* This is a guide only. Some children may need to transition at a different pace and may have a different number of feeds per day than illustrated above._

_\* The table above demonstrates a suggested approach for babies on 5 feeds per day. This is an example only._

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Frequently Asked Questions

How long should a formula transition take?

A gradual transition typically takes 7–10 days, replacing one feed at a time every 1–3 days. Some babies may need longer, particularly those with sensitive tummies or specific sensitivities. Always follow your baby’s cues and consult your healthcare professional if you have concerns.

Can I mix two different formula brands in the same bottle?

No. Different formula brands and types have different mixing ratios and instructions. It’s best to swap complete feeds rather than mixing formulas in the same bottle. Mixing may also result in an incorrect concentration of nutrients.

What should I do if my baby refuses the new formula? 

If your baby is refusing the new formula, try offering it at a time when they are hungriest (usually morning). Make sure the temperature is right and that you’re using familiar bottles and teats. If refusal continues, speak to your paediatrician or child health nurse.

What physical changes are normal when switching formula?

Changes in stool colour, frequency, and consistency are common during a formula transition. Your baby may also seem more or less settled than usual. These changes are usually temporary. If you notice a rash, significant distress, or your baby is not feeding well, consult your healthcare professional.

Is it safe to switch from cow’s milk formula to goat’s milk formula?

Yes, provided your baby does not have a confirmed cow’s milk protein allergy (CMPA) with potential cross-reactivity to goat’s milk. Always discuss formula changes with your paediatrician, particularly if your baby has any known sensitivities, was born prematurely, or has any medical conditions.