Avent Nipple Sizes: Find Our Recommendations By Age

My Recommendation for Avent Nipple Sizes:


  1. Learn Which Teat is Right for Your Baby
  2. How Long Does it Take Baby To Finish Bottle?
  3. When To Upgrade Nipple Flow Level? (Find the right nipple flow in this third section)

Learn Which Teat is Right for You and Your Baby

Nipple sizes for their breastfed bottles vary depending on where your little one is in their life.

For babies who are alternating between breastfeeding and bottle usage, 1 is the recommended number of Avent nipple sizes.

The number 1 is recommended to use regardless of the babies age if alternating between breast and bottle is the practice.

However, while this may be recommended, Avent nipple sizes also go to 2 and 3 for a reason. Not every child is the same.

Avent Nipple Sizes Photo

Some mothers have upgraded from the 1 to the 2 and even the three after their baby is 12 weeks old. It all depends on the baby’s size.

The size of the nipples themselves have to do with the flow of milk into the baby’s mouth.

The number 1 nipple has the lowest flow, the 2 more and the 3 even more.

The main reason for these sizes, aside form the growth of the baby, is the fact that newborns cannot keep up with the flow of milk as fast as a baby who is six months old.

They can easily choke if they get too much intake at once

so regulating the flow with these Avent nipple sizes is key in making sure the kiddo is getting the right amount and the right speed.

Sometimes, younger babies may not be getting enough nourishment from the 1

so switching to a higher flow nipple will improve the intake for the little one and keep them satisfied.

Again, while there are standard practices and recommendations out there regarding what size Avent nipples to use in regards to the size of your baby

the most important thing to know is your individual little angel. That way, you can keep them in the right nipple at the right age.

How Long Does it Take Baby To Finish Bottle?

Staying in tune and being readily aware of how quickly or slowly your child finishes his or her bottle is very important to ensuring the early health of your infant.

This is because the rate at which your baby feeds is a direct indicator of how much he or she is drinking

how much air your baby is swallowing

and how much your baby is enjoying the milk and feeding experience.

In general, you should expect your child to feed as follows:

Newborn babies will feed for about twenty to forty minutes until they are about three months of age.

When feeding your baby, it is a good idea to check for milk dripping down the side of your baby’s mouth and to be aware if your baby has any gas.

If your baby is finishing the bottle in less than twenty minutes, and has made a mess or has gas afterwards, the nipple size is probably too large.

Then again, if your child is struggling to finish the bottle after forty minutes, the baby probably needs a larger nipple size.

Infants who are from three to size months old should be finishing the bottle between fifteen and thirty minutes.

Once again, pay attention to the way your baby reacts during and after feeding to see if the feeding is an enjoyable experience for your infant.

Finally, babies who are six months old and older generally finish the bottle between ten and twenty minutes.

Keep in mind that these time ranges are just referenced points and are helpful for making changes to the nipple size.

For instance, if your baby is of the recommended age, but is swallowing too much air and is drinking too quickly for the suggested time frame

this could be a sign that the nipple size is too large, and the baby is not able to keep up with the flow of milk into his or her mouth. Avent nipples will help to regulate the flow of milk to your child.

It is best for you to try to stick within the recommended feeding time range when determining whether or not the Avent nipple sizes are appropriate for your child’s age.

Paying attention to how your infant drinks and reacts is critical to determining when to switch Avent nipple sizes.

When To Switch To Another Nipple Flow Level? (upgrade level)

**Some links on this page can take you to Amazon.com, where you can see prices, customer reviews, product specs, etc … Please note that we only share stuff we love. We may earn a small commission if you buy through our links.

List of Avent nipples for Natural & Classic bottles
Natural Bottle Classic Bottle
Ideal for newborns (Birth to 4 Weeks) Newborn Flow Newborn Flow
Ideal for newborns and breastfed babies of 1 to 3 Months Slow Flow Slow Flow
For bottle fed babies (3-4 to 6 Months) Medium Flow Medium Flow
Offers a faster flow for older babies Fast Flow Fast Flow

It is important to be very observant when it comes to how well your infant is feeding.

For instance, if you see milk running down your child’s face, this could be an indication of too fast of a flow through the nipple.

You would then want to opt for a smaller Avent nipple size.

On the other hand, if your child looks to be struggling to get enough milk out of his or her bottle (excessive sucking, apparent frustration)

then it might be time to upgrade the nipple size to a larger one.

In general, we recommend following the below guidelines for getting started on the appropriate size Avent nipple.

Babies who are still being breastfed, but who are also starting to drink out of a bottle, should use the smallest size.

This is called the Newborn nipple. It has one hole, which is easy to remember: one hole for one month old.

Infants who are one to three months old and who are also still breastfeeding should go for the next size up, which is the Slow Flow nipple. This nipple has two holes.

After that, infants who are three to six months old should be happy with the Medium Flow nipple. This one has three holes.

And finally, the Fast Flow nipple is suitable for infants who are six months old and older.

In general, these are just guidelines.

If you find that your child has gas and a bloated belly, and is currently drinking out of the Fast Flow, it might be a good idea to go back to the Medium Flow for a couple more weeks.

In addition, babies who are spitting up might also need to go to a slower flow.

Age can be an arbitrary number and reference point, though it is still very helpful for getting started.

Be open to experimenting and slowly easing into the transition.

Your baby will tell you what he or she needs. Within these age divisions and nipple sizes, Avent also offers two more options.

The First Flow nipple is optimal for preemies and newborns.

This one compares to the Newborn Nipple, which as stated above, is ideal for newborns up to a month old, and breastfed babies up to three months old.

This might be a good option to use if your child is not breastfeeding at all.

The other option is the Variable Flow Nipple, which is suitable for infants who are three months old and older.

It provides different flow rates with the same nipple. If your infant is having a hard time adapting from the Medium Flow to the Fast Flow nipple sizes, we recommend trying the Variable Flow nipple.

Knowing when to switch Avent nipple sizes is not so challenging, so long as you are aware of how much or little your child is enjoying feeding.

If your child seems generally happy and healthy, chances are that you already have the right size nipple.

The most difficult time is during transitions, though these can still be timely and comfortable for your infant, due to the multiple different nipple sizes that Avent offers.

Remember that being acutely aware of your child during feeding, and making regular changes to the nipple size as your baby develops, is much better than sticking with a standard nipple size the whole way through.

Additional information:

Photo & Video credits: AmazonPhilips.


    • Hi Sitwat,
      It’s actually preferred that you keep the slowest flow nipple that they’ll tolerate to prevent them from developing a flow preference for the bottle after the breast. Is there a reason you want to change?

  1. My daughter is 3months i still have her on 0+ i want to put her on 1+ or 3+ do you think 3 is to much for her because she was weeks old she will choke on her milk with the 1+.

    • Hi Quinch,
      if your baby is still doing fine with the newborn nipple, there’s nothing wrong with sticking with it. Honestly I would keep the nipple on the smallest size. You want the babe to have to work for the milk just like they work for the milk while nursing. My LO was on the premie nipple until she weaned herself off bottles.

  2. Hello, my 7 week old had been using the size 0 nipple. Lately, her nipple has been collapsing so when we switched from the 2 oz avent bottles to 4, we are trying the size 1 nipples. But this seems to be making her burp more and she seems like she keeps wanting more and more milk. She also sucks down the bottle much quicker. Could this nipple size be too fast?

    • Hi Kathleen,
      I’ve always heard to stick with the lowest flow nipple size for a breastfed baby.
      On la leche league they often say that your breasts aren’t going to change flow sizes so why should your bottles? Kinda makes sense to me. We’ve stuck with the lowest flow available and my twins are 4 months now. You can just spin the bottle if they collapse the nipple or make them take a pause in their feeding.

    • We had the same issue with the collapsing nipped when we first started using these as well. We notice that there are vent grooves on the nipple. Just look on the nipple where the number is.

      You have to line up that vent with with the small notch on the bottle cap. This will allow air onto the bottle and the nipple will no longer collapse on you.

      Also note that when you sure on the cap to the bottle that the nipple will sometimes move.

      Other than that small issue the Lo loves these bottles

  3. My baby doesn’t seem to like the Avent natural flow nipples. We were at a 1 and went up to a 2. Things have gotten better, but he still falls asleep half way through the bottle and then doesn’t want to take the nipple again. He seems to be working to hard for it. Should I go up to a 3?

  4. my baby turns 3 month old yesterday and he’s using classic avent with #1 flow but whenever he drinks his milk he spills it on the side of his mouth and he seems complaining and didn’t like the nipple?

  5. My son is 4 weeks old. I am looking at increasing the nipple from 1 to 2. Main reasonis he is drinking 4-5 oz each feeding, but always falls asleep before he is done. Wake him up, and he beign sot suck more. It is a never ending battle to keep him awake while feeding. I thought maybe the increased flow would help keep him awake more. Crazy thought?
    Also, does the nipple size/flow have anything to do with amount of gas? Would a slower or faster nipple cause him to drink more air pockets, and cause more gas?

    • Hi,
      In my opinion if a 6+ month nipple is insufficient, maybe you could just start switching to a sippy cup?

  6. Hey my son is a month and a half old. I bought him the avent bottles but got his the stage 1s .. I’m not sure how to go about switching him bottles. But we battled thrush and I just want to toss these bottles I’m using right now at the time. I tried him on the new bottle and when he drinks it he spills a lot on the side also. Is this him saying he isn’t ready for a faster nipple ? Do I have to go buy the lowest avent nipples for him then? Right now he’s using drop in Playtex bottles. But I love avent way better and then it’s easier with measuring everything also.. I’m so lost on what to do. I’m thinking about buying slower nipples but I’m nervous he will want a change soon.. And if there is even a point ..

  7. My son is 2months old. And I received cute money bottles they are size 2 flow 9oz . I breast fed but when I have work he takes a bottle with size 1 flow.. should I keep with size 1 or can I upgraded to 2

    • Hi Kathy
      I have somewhat of an oversupply and a fast flow, so I moved mine up to the next flow rate and he eats much more happily. Just from my own experience, it may be best to try and match your own flow rate, if you can figure out what that is. Otherwise, if your baby is still doing fine with the size 1 flow, there’s nothing wrong with sticking with it.

  8. My son is 1 month old but was premature and gets tired very easily when sucking. I use the size 1 nipple for 0+ months, but he never drinks the full amount that he was getting at the hospital because he still gets tired, and I’m scared he is going to start losing weight. Should I start him on the next level nipple?

    • Hi Natalie,
      Well, My friend’s son could not suck enough either, and so he is getting his supplemental pumped breast milk via liquid medicine dropper, which he can drink from but takes much less effort. Might want to discuss this option with your doc?

  9. My one year old uses a sixe2 nipple but when I try and switch it to a faster flowhe doesn’t like it. He has aippy cups and tolerates thisefine but bottles he used to go to sleep. Should I just leave it at a 2of change it?

    • Hi Maria,
      If he still doing fine with size 2, so may as well just leave it like it is, no reason to try and fix something that’s not broken. He’ll probably take Less air that way too.

  10. Hi, my child is exclusively formula fed. Now he is 6 months old and using size 4 . I buy new nipples after every three months. Which nipple size should i give him when he is 9m plus?

    • Hi, Bigger baby is not mean bigger nipple, you don’t to change nipples after every three months, the feeding guide still a theoretical thing its only your LO who can decide when to go up a nipple size, How can you know that? If your baby suddenly starts acting pissed off during feedings, or fussing at the bottle, it may be an indication that he’s ready to change it up.
      But, for now just keep his nipple size 4 even he is 9m+ and watch him.

      • My Doughter is 5 month. I still give her size 1 Avent Nipple. is it oky to continue with size 1?or shall i immiditly Change to different Nipple Size. Ehat is the correct size for her Age. And soon she will be six Month. pls Advice

  11. hi there,

    my 5mos. old baby using the 0+nipple 9from avent bottle) is it ok if im goin to switch it to 1+ size nipple.

  12. Our twin boys were born in week 36.6. They are now 5 weeks old. They are breast fed for 15 min followed by formula using an Avent natural bottle. Have been using the smallest size nipple but one of my kiddos was taking 45 min or longer for 60 ml. I tried the number 2 nipple and he is finishing in 15 min. Not sure of correlation but he’s started a pacifier at the same time as well and does not last the entire 15 min on thr breast anymore. Any ideas.? Are the blog masters just moms or professionals? Thanks

  13. My breastfed baby used a size 1 nipple up until 4 months of age. The past 2 days he has refused a bottle (he will begin to suck, then gets aggravated and starts crying). We tried to change the nipple size to a size 2, but he still does not seem happy.

    Any suggestions?

  14. Good Day

    Would like to know if a size 1 bottle whole is too big for my new born, do you have another smaller size I can use?

    Kind Regards

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