My Baby Won't Switch Between Breast and Bottle (Nipple Confusion)
Medically reviewed by Dr. Rachel Kim, MD, RDN · Pediatric Nutrition Specialist
Content reviewed against published La Leche League, AAP, NIH guidelines
Last reviewed:
Feeding challenges are one of the most common concerns new parents face. When it comes to won't switch between breast and bottle (nipple confusion), here is what the guidelines recommend.
The short answer
What is commonly called "nipple confusion" is more accurately described as flow preference. Babies are not confused — they can tell the difference between breast and bottle. Some develop a preference for the faster, more consistent flow of a bottle and become frustrated at the breast. Others, accustomed to the breast, refuse a bottle. This is common and does not mean you cannot combo-feed. Strategies like paced bottle feeding, slow-flow nipples, and timing can help babies accept both.
Key takeaways
- What is commonly called "nipple confusion" is more accurately described as flow preference. Babies are not confused — they can tell the difference between breast and bottle. Some develop a preference for the faster, more consistent flow of a bottle and become frustrated at the breast. Others, accustomed to the breast, refuse a bottle. This is common and does not mean you cannot combo-feed. Strategies like paced bottle feeding, slow-flow nipples, and timing can help babies accept both.
- Usually normal when: Your baby has a mild preference for one feeding method but will accept the other with patience
- Call your doctor if: Your baby is refusing both breast and bottle and is showing signs of dehydration — fewer wet diapers, dry mouth, sunken fontanelle — seek immediate medical care
- Varies by age — see the age-by-age breakdown below
“The AAP recommends exclusive breastfeeding for approximately 6 months after birth. Furthermore, the AAP supports continued breastfeeding, along with appropriate complementary foods introduced at about 6 months, for 2 years or beyond.”
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What Parents Should Know
According to La Leche League, AAP, NIH guidelines, what is commonly called "nipple confusion" is more accurately described as flow preference. Babies are not confused — they can tell the difference between breast and bottle. Some develop a preference for the faster, more consistent flow of a bottle and become frustrated at the breast. Others, accustomed to the breast, refuse a bottle. This is common and does not mean you cannot combo-feed. Strategies like paced bottle feeding, slow-flow nipples, and timing can help babies accept both. At 0-4 weeks, in the early weeks, many lactation consultants recommend avoiding bottles until breastfeeding is well-established (usually around 3-4 weeks), because newborns are still learning to coordinate the different oral mechanics of breast and bottle. However, if supplementation is medically necessary, it should not be delayed for fear of nipple confusion — a well-fed baby is the priority. If you need to supplement, ask about paced bottle feeding technique. It is generally considered normal when your baby has a mild preference for one feeding method but will accept the other with patience. However, you should contact your pediatrician promptly if your baby is refusing both breast and bottle and is showing signs of dehydration — fewer wet diapers, dry mouth, sunken fontanelle — seek immediate medical care.
Normal vs. Concerning
By Age
What to expect by age
0-4 weeks
In the early weeks, many lactation consultants recommend avoiding bottles until breastfeeding is well-established (usually around 3-4 weeks), because newborns are still learning to coordinate the different oral mechanics of breast and bottle. However, if supplementation is medically necessary, it should not be delayed for fear of nipple confusion — a well-fed baby is the priority. If you need to supplement, ask about paced bottle feeding technique.
1-3 months
This is the most common window for bottle introduction for breastfed babies. If your baby refuses the bottle: try having someone other than the nursing parent offer it, try different bottle brands and nipple shapes, try offering when baby is calm but not starving, and be patient. If your baby refuses the breast after getting bottles: ensure you are using slow-flow nipples, practice paced feeding (holding bottle horizontally, pausing frequently), and offer the breast first when baby is hungry but not frantic.
3-6 months
If a bottle-fed baby is refusing the breast, a "bottle wean" can sometimes help — gradually offering the breast more and the bottle less, with lots of skin-to-skin contact. If a breastfed baby is refusing the bottle as a parent returns to work, try different nipple types, offer the bottle in a different position than breastfeeding, and consider cup feeding or syringe feeding as an alternative if bottles are completely rejected.
6 months+
By 6 months, you can also introduce an open cup or straw cup, which may be easier for some babies than switching between breast and bottle. The urgency of the bottle issue decreases as solid foods are introduced. Many babies who refused bottles will happily accept cups.
What to Tell Your Pediatrician
- Describe when you first noticed won't switch between breast and bottle (nipple confusion) and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if your baby completely refuses all bottles and you need to return to work or have another reason bottles are necessary.
- Mention if your baby has stopped latching after bottle introduction and you want to continue breastfeeding.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Your baby has a mild preference for one feeding method but will accept the other with patience
- Your newborn takes a few feeds to get used to a new nipple type — an adjustment period is normal
- Your baby accepts bottles from others but prefers to breastfeed with the nursing parent
- Your baby completely refuses all bottles and you need to return to work or have another reason bottles are necessary
- Your baby has stopped latching after bottle introduction and you want to continue breastfeeding
- Your baby is not getting enough intake from either method and weight gain is affected
- You are feeling stressed and overwhelmed trying to manage the transition
- Your baby is refusing both breast and bottle and is showing signs of dehydration — fewer wet diapers, dry mouth, sunken fontanelle — seek immediate medical care
- Your baby is losing weight or not gaining weight because of feeding refusal — contact your pediatrician promptly
What You Can Do at Home
- Keep track of when you notice won't switch between breast and bottle (nipple confusion) — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that your baby has a mild preference for one feeding method but will accept the other with patience — this is generally within the range of normal.
- At 0-4 weeks, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Offer feeding in a calm, distraction-free environment. Avoid forcing or pressuring your baby to eat.
- While monitoring at home, seek immediate care if your baby is refusing both breast and bottle and is showing signs of dehydration — fewer wet diapers, dry mouth, sunken fontanelle — seek immediate medical care.
Related Conditions
What Is Paced Bottle Feeding and Should I Be Doing It?
Paced bottle feeding (also called responsive bottle feeding) is a technique that slows down the flow of milk from a bottle to more closely mimic the pace of breastfeeding. The baby is held upright, the bottle is held horizontally, and frequent pauses are built in to allow the baby to regulate their intake. This approach reduces overfeeding, decreases gas and spit-up, supports the breastfeeding relationship for combo-fed babies, and helps all babies develop healthy hunger-fullness cues. Paced feeding is recommended by most lactation professionals for all bottle-fed babies.
My Stored Breast Milk Smells Soapy or Sour (High Lipase)
If your stored or thawed breast milk smells soapy, metallic, or sour — but was stored properly — you likely have high lipase activity. Lipase is a naturally occurring enzyme in breast milk that breaks down fats. In some mothers, lipase is especially active and begins breaking down fats quickly, creating an off-putting smell and taste. High lipase milk is not spoiled or harmful to your baby. However, many babies refuse it because of the taste. The solution is scalding fresh milk before storing it, which deactivates the lipase.
Could My Baby Have a Posterior Tongue Tie?
A posterior tongue tie is a restriction of the tissue under the tongue that is not easily visible and must be felt by an experienced provider. It can cause breastfeeding difficulties including a painful or shallow latch, clicking sounds during nursing, and poor weight gain. Diagnosis and treatment recommendations vary among healthcare providers, so getting an evaluation from a lactation consultant experienced with tongue ties is often a helpful first step.
Related Resources
Feeding & Nutrition Guide
Complete guide to breastfeeding, formula feeding, and solid food introduction.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
When to Call the Doctor
General guide on when to call the pediatrician, visit urgent care, or go to the ER.
Frequently asked questions
Is won't switch between breast and bottle (nipple confusion) normal?
When should I call the doctor about won't switch between breast and bottle (nipple confusion)?
When is won't switch between breast and bottle (nipple confusion) normal?
What causes won't switch between breast and bottle (nipple confusion)?
What should I mention to my pediatrician about won't switch between breast and bottle (nipple confusion)?
Is won't switch between breast and bottle (nipple confusion) normal at 0-4 weeks?
Is won't switch between breast and bottle (nipple confusion) normal at 1-3 months?
Should I go to the ER for won't switch between breast and bottle (nipple confusion)?
Does won't switch between breast and bottle (nipple confusion) go away on its own?
References
- [1]La Leche League International. Bottles and Other Tools. La Leche League
- [2]American Academy of Pediatrics. Bottle Feeding Basics. HealthyChildren.org. AAP
- [3]National Library of Medicine. Nipple Confusion and Breastfeeding. Journal of Human Lactation, 2019. NIH
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss My Baby Won't Switch Between Breast and Bottle (Nipple Confusion).
Things to mention
- Describe when you first noticed won't switch between breast and bottle (nipple confusion) and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if your baby completely refuses all bottles and you need to return to work or have another reason bottles are necessary.
- Mention if your baby has stopped latching after bottle introduction and you want to continue breastfeeding.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- Your baby completely refuses all bottles and you need to return to work or have another reason bottles are necessary
- Your baby has stopped latching after bottle introduction and you want to continue breastfeeding
- Your baby is not getting enough intake from either method and weight gain is affected
Urgent signs to report immediately
- Your baby is refusing both breast and bottle and is showing signs of dehydration — fewer wet diapers, dry mouth, sunken fontanelle — seek immediate medical care
- Your baby is losing weight or not gaining weight because of feeding refusal — contact your pediatrician promptly
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of won't switch between breast and bottle (nipple confusion) are normal. Talk to your pediatrician if your baby is refusing both breast and bottle and is showing signs of dehydration — fewer wet diapers, dry mouth, sunken fontanelle — seek immediate medical care.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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Related Feeding Concerns
What Is Paced Bottle Feeding and Should I Be Doing It?
Paced bottle feeding (also called responsive bottle feeding) is a technique that slows down the flow of milk from a bottle to more closely mimic the pace of breastfeeding. The baby is held upright, the bottle is held horizontally, and frequent pauses are built in to allow the baby to regulate their intake. This approach reduces overfeeding, decreases gas and spit-up, supports the breastfeeding relationship for combo-fed babies, and helps all babies develop healthy hunger-fullness cues. Paced feeding is recommended by most lactation professionals for all bottle-fed babies.
My Stored Breast Milk Smells Soapy or Sour (High Lipase)
If your stored or thawed breast milk smells soapy, metallic, or sour — but was stored properly — you likely have high lipase activity. Lipase is a naturally occurring enzyme in breast milk that breaks down fats. In some mothers, lipase is especially active and begins breaking down fats quickly, creating an off-putting smell and taste. High lipase milk is not spoiled or harmful to your baby. However, many babies refuse it because of the taste. The solution is scalding fresh milk before storing it, which deactivates the lipase.
Could My Baby Have a Posterior Tongue Tie?
A posterior tongue tie is a restriction of the tissue under the tongue that is not easily visible and must be felt by an experienced provider. It can cause breastfeeding difficulties including a painful or shallow latch, clicking sounds during nursing, and poor weight gain. Diagnosis and treatment recommendations vary among healthcare providers, so getting an evaluation from a lactation consultant experienced with tongue ties is often a helpful first step.
When to Introduce Allergens to Baby
Current guidelines recommend introducing common allergens (peanut, egg, cow's milk products, tree nuts, wheat, soy, fish, shellfish, sesame) starting around 4-6 months when your baby is developmentally ready for solids. The landmark LEAP study showed that early introduction of peanuts (by 4-6 months) reduced peanut allergy risk by 80% in high-risk infants. Do not delay allergens - the old advice to wait until 1-3 years has been reversed because early exposure actually prevents allergies.
I'm Worried My Baby Is Aspirating During Feeds
Aspiration means liquid or food enters the airway instead of the stomach. Occasional coughing during feeds is common and does not usually indicate aspiration. True aspiration is less common and may present as recurrent respiratory infections, a wet or gurgly voice after feeds, or chronic cough. If you are concerned, a swallow study can provide a definitive answer.
When Does My Baby Need Amino Acid Formula?
Amino acid-based formulas (also called elemental formulas) are prescribed for babies with severe cow's milk protein allergy, multiple food protein intolerances, or conditions like eosinophilic esophagitis who cannot tolerate standard or extensively hydrolyzed formulas. They are the most hypoallergenic formula available because the proteins are broken down into individual amino acids, making allergic reactions virtually impossible.