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Choosing the right nipple flow helps your baby feed comfortably, control the pace of milk, and swallow less air during feeds.
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Breastfeeding naturally changes flow throughout a feed, while bottle nipples provide a more consistent flow, so selecting the right nipple size is important.
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Tommee Tippee flow rates start at size extra slow through to fast flow, with each size supporting your baby through their feeding journey.
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Signs your baby may need a different nipple include coughing, milk leaking from their mouth if the flow is too fast, frustration, longer feeds, and falling asleep before finishing if the flow is too slow.
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Always follow your baby's feeding cues rather than age alone, and consider a slower-flow anti-colic nipple if you're combination feeding or want to support a more breast-like feeding pace.
Choosing the right nipple flow rate can make bottle feeding more comfortable and less stressful for both babies and parents.
Understanding flow rate is an important step in successful bottle or combo-feeding.
Parents searching for bottle refusal help and answers to “why won’t my baby take a bottle?” can use this guide to help find the right flow rate for their baby.
What are flow rates?
Flow rate is the speed at which milk flows out of a baby bottle.
It is based on the size or shape of the opening in the tip of a nipple. This changes the pace at which the milk flows into your baby's mouth.
The larger the hole, the faster the pace.
Why flow rates matter during feeding
Flow rate is just as important as nipple shape for bottle acceptance. The right flow rate can make feeding easier and more comfortable for babies.
Flow rate issues can sometimes contribute to baby refusing bottle as if it’s too slow or too fast, it can cause frustration or excess air intake.
Matching the nipple flow to your baby’s feeding style can improve bottle acceptance in both exclusive bottle feeding or combo-feeding.
How nipple flow affects comfort, wind and feeding pace
Nipple flow affects how easily babies coordinate sucking, swallowing, and breathing.
A fast flow rate may cause gulping and excess air intake, which can increase wind and discomfort.
A slower flow rate often supports paced feeding, though a nipple that is too slow may lead to long or frustrating feeds.
How to choose the right nipple flow for your baby
The ideal flow rate depends on your baby's age, feeding pace, and whether they are breastfed or formula-fed.
When considering how to choose nipple flow, it helps to focus on feeding behaviour rather than age labels alone, as these can vary between brands and every baby is different.
As every baby is different, that’s why we have a wide range of flow rates so you can find the right flow for your baby at every stage.
Each Tommee Tippee bottle nipple is marked with a letter or number according to its flow rate.
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0 = Extra Slow Flow: For first feeds and a gentle pace from birth, helpful for adjusting to latching and sucking.
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1 = Slow Flow: For newborns and up. With the smallest opening for slower feeds.
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2 = Medium Flow: For babies aged 3 months and up. With a medium opening for baby’s growing appetite.
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3 = Fast Flow: For babies aged 6 months and up. With the largest opening for faster feeds.
- Y = Thick Flow: For babies 6 months and up, the Y-cut opening allows thicker liquids to pass through.
Please note that the ages mentioned above are only a guide. You know your baby better than anyone and will be able to tell when they’re ready for a nipple with a different flow rate.
How to do a flow rate test
You can use your baby’s age as a starting point to calculate flow rate, but every baby feeds differently.
A simple flow rate test involves filling the bottle, turning it upside down, and watching how the milk flows. A slow-flow nipple should release milk slowly in individual drops rather than a steady stream.
You can also observe your baby during feeds. Signs in this blog can help you identify whether the current flow rate is too fast or too slow.
Why nipple shape and flow rate both matter
Flow rate formula is a big part of comfortable feeding, but so is nipple shape.
Nipple shape also affects how babies latch and feed from the bottle, but there’s no one-size-fits-all shape. Some babies prefer wider, breast-shaped nipples, like our original Wide Latch nipple, while others feed better from triangular designs, like our Deep Latch nipple.
Choosing the right combination of nipple shape and flow rate can help support calmer, more comfortable feeds. You can read our guide on choosing the right nipple shape here.
Does flow rate affect latching?
Yes, flow rate can affect how well a baby latches during bottle feeding. If the flow rate is too fast, babies may struggle to coordinate sucking, swallowing, and breathing, causing them to slip off the nipple or repeatedly break suction.
If the flow rate is too slow, babies may suck harder to get milk, which can also lead to shallow latching, clicking noises, or frustration during feeds.
Nipple shape also plays a role, but choosing the right flow rate can help babies maintain a deeper, more comfortable latch and support calmer feeding overall.
How bottle-feeding mechanics differ from breastfeeding
Breastfeeding allows babies to control milk flow through active sucking and pauses. Bottle feeding works differently because milk flow rate is influenced by gravity and nipple design. Some bottles release milk faster and with less effort, which can affect feeding comfort.
For parents whose breastfed baby won’t take bottle, the difference in flow rate is often a key reason.
A different flow can better mimic your breast flow and support smoother transitions between breast and bottle.
Our nipple shapes and wide choice of flow rates have been designed to reduce this nipple confusion by supporting a good latch and natural pace.
If you are breast and bottle feeding, you may find our combo-feeding guide helpful.
How milk flows during breastfeeding
During breastfeeding, milk flow changes throughout the feed rather than staying constant. Babies control the pace by sucking, pausing, and swallowing naturally. When sucking stops, milk flow slows or stops too.
This natural regulation helps babies feed comfortably and manage intake more effectively.
Why some bottle nipples flow faster than the breast
Bottle nipples vary widely in flow rate. Larger openings or softer nipples may allow milk to flow faster than breastfeeding.
A quick flow rate test can help parents compare nipples. If milk drips rapidly when the bottle is tipped, the nipple may deliver milk too quickly for the stage that some babies are at.
Do breast milk or formula need different flow rates?
No, breast milk and formula do not inherently require different flow rates. It is the technique that baby uses for feeding that affects the flow rate they need, not the type of milk.
Signs your baby needs a different rate nipple
You should change the flow rate you use over time to keep up with your growing baby (and their growing appetite).
You can use the age brackets of each nipple size to gauge when it's time to move up a flow rate, but your baby will also let you know when it's time to change, or even if you've moved up too quickly.
Signs a nipple flow may be too fast
A nipple flow may be too fast if your baby is ...
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coughing, spluttering, or gulping
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milk is spilling out of their mouth
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refusing to feed or frequently pulling away
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increasingly gassy after feeding
If you see these signs, you may want to move to a slower flow rate.
Signs a nipple flow may be too slow
A nipple may be too slow if your baby...
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takes longer than 20 minutes to finish a feed
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tugs at the nipple
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falls asleep while feeding
If your baby is experiencing this, you may want to move up a flow rate.
Other signs baby needs different nipple sizes include collapsing nipples and repeated clicking noises during feeds.
Should breastfed babies use slow flow nipples?
Sometimes, yes, a slower flow may be a better match for your natural breastfeeding flow rate.
Slow flow nipples encourage paced feeding – a technique that mimics the stop-start motion of breastfeeding and gives them the chance to check in on their own appetite - and may help reduce nipple confusion.
