How to Switch Infant From Breastmilk to Formula: The First 7 Days

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Switching from breast milk to formula is a big step in your baby’s feeding journey. Whether the change is due to a return to work, low milk supply, or personal choice, it’s crucial to approach the transition with care and patience. The first seven days can feel overwhelming, but a gentle plan can help make things easier for you and your little one.

That said, here are a few tips on how to switch your infant from breast milk to formula:

Day 1: Start With a Single Bottle

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The first day is all about testing the waters. Start with just one bottle of formula when your baby is usually in a good mood and not too hungry. This makes it easier for them to explore the new taste and sucking actions without feeling frustrated or overwhelmed.

Create a soothing environment during this initial formula introduction. Hold your baby close to provide comfort and skin-on-skin contact, similar to their experience with breast milk.

If your baby turns away or refuses the bottle, stay calm and try again during the next feeding time.

But before you offer that first bottle, you need to find the right baby formula. Look for trusted brands, such as Happy Baby Organic Formula, that can provide balanced nutrition and support healthy development.

It’s a good idea to consult your pediatrician for feeding advice tailored to your baby’s gestational age and feeding cues.

Day 2: Offer a Bottle at the Same Time Again

Building consistency during the early stages of formula introduction can help babies feel secure and supported. On the second day, offer a bottle of infant formula at the same time as the day before.

A predictable feeding schedule reinforces routine, allowing your baby to adjust to the change from breast milk with greater ease.

Are they sucking more eagerly? Are they still hesitant? If they only take a small amount, that’s perfectly normal. Every little step counts as progress. Offer gentle encouragement and maintain skin-on-skin contact to strengthen the bond and help your baby feel comforted throughout this transition.

Day 3: Increase to Two Bottles

As your baby becomes more familiar with formula feeding, you can give them two bottles throughout the day. Try spacing them out. For instance, you can give them one in the morning and another in the evening at times when your baby is calm and content.

Keep an eye on their bowel movementsย and overall comfort, as digestive changes are common during the early days of formula feeds.

If you notice any signs of discomfort, such as gassiness or fussiness, take note of it and consider discussing it with your pediatrician to know what to do next.

Day 4: Watch for Patterns and Cues

By day four, you may start noticing feeding patterns and behavioral shifts. Some babies adapt to formula milk with ease, while others need more time.

This is the time to watch closely for cues your baby is giving you, such as steady sucking, eagerness during feeding time, or turning away when full. These subtle signals can guide your next steps and help create a more comfortable experience.

You may also start to see your baby develop preferences. Some respond better to warmer milk temperatures, while others are content with room temperature.

Take note if your baby seems more satisfied after certain formula feeds or finishes bottles more consistently. This will help you build a routine that supports your baby’s needs and your daily rhythm.

Day 5: Replace a Third Feeding

Once your baby shows signs of comfort and familiarity with bottle feeding, you can begin replacing a third breastfeeding session with formula.

Choose a time that feels natural, such as during a shorter feeding or a calm nap period. The aim is to introduce this additional formula feed without upsetting your baby’s sense of routine or emotional security.

As you make this adjustment, continue to focus on responsive feeding. Use eye contact, calming voices, and gentle physical contact to maintain the closeness your baby associates with breast milk.

This can help support bonding and make the growing number of formula feeding sessions feel safe and reassuring for your baby.

Day 6: Adjust Based on Baby’s Response

Every baby is unique, so it’s crucial to adjust the pace based on how your little one is reacting. Some babies may be ready for more bottles, while others need more time. If your baby is fussy, gassy, or rejecting the bottle, slow down and return to fewer formula feeds for a day or two.

You can also experiment with different bottle nipples or types, as some babies are sensitive to flow or shape. Remember that formula brands can vary in taste, so speak to your pediatrician if your baby needs a different option.

Day 7: Build a Comfortable Routine

As you reach day seven, you’ll likely have a clearer understanding of your baby’s preferences and how they respond to mixed or full formula feeding. Whether you’re still offering breast milk alongside formula or have made a complete switch, this is the time to establish a routine that supports your baby’s comfort and daily flow.

Aim for calm and consistent feeding times in a familiar setting, using the same bottle and feeding techniques to create a sense of predictability. If you prepare to return to workย or include caregivers, gradually involve them in formula feeds.

This will help your baby bond with others while adjusting to a shared feeding schedule.

Conclusion

Switching from breast milk to formula is a personal journey that unfolds differently for every family. The first seven days offer a valuable window to gently guide your baby through this change with patience, comfort, and attentiveness.

Whether you continue with mixed feeding or fully transition to infant formula, remain consistent to find a rhythm that supports your baby’s development and your family’s lifestyle.

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Julie is a Staff Writer at momooze.com. She has been working in publishing houses before joining the editorial team at momooze. Julie's love and passion are topics around beauty, lifestyle, hair and nails.