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Choosing the right baby teat size and flow rate matters because babies develop at different rates. Age guides are useful, but feeding behaviour also matters.
Slow, medium and faster teat flows
Baby bottle teat labels such as slow flow, medium flow and faster flow describe how quickly milk passes through the teat. Exact naming and flow levels vary by brand, so a NUK flow stage and a Philips Avent flow stage should not be assumed identical.
Signs the flow may be too slow
- Feeds take unusually long
- Baby becomes frustrated or pulls away
- The teat collapses during feeding
- Baby sucks very hard with little milk flow
Signs the flow may be too fast
- Coughing or spluttering
- Milk leaking from the mouth
- Very fast feeds
- Difficulty coordinating sucking and swallowing
Do not move up a teat size just because of age
Age ranges are general guidance. Some babies remain comfortable with a slower flow for longer. Feeding ability and behaviour matter more than age alone.
Brand compatibility matters
Use teats designed for your exact feeding system. NUK and Philips Avent use different bottle and teat systems and should not be assumed interchangeable.
Compare the brands in our NUK vs Philips Avent baby bottle guide, or browse baby feeding bottles and accessories.
Frequently asked questions
When should I move to a faster teat?
Consider both the manufacturer's guidance and signs that the current flow is too slow.
Can a faster teat cause problems?
If the flow is too fast, a baby may cough, gulp or struggle to coordinate feeding.
Does a bigger baby always need faster flow?
No. Feeding ability matters more than size alone.
Can I enlarge the teat hole myself?
Do not modify feeding teats. Use the correct manufacturer-specified flow instead.
Related feeding guides
Compare bottle systems in our NUK vs Philips Avent comparison, understand baby bottle sizes, and browse current feeding bottles and compatible accessories.
