Product leaked from air vent holes and rim, I was sent replacements and they still leaked. I boiled them and it helped a bit but then started leaking again. Baby would be soaked after every feeding.

Amazing product! I wish I had found these years ago but I am very glad to have them now. Will continue to use these and will recommend to everyone I meet.

Absolutely love these baby bottle nipples. The shape allows for an almost seamless transition from breast to bottle and vice versa. The slow flow nipple truly is slow flow so baby isnt being choked by milk gushing out, even with his strong suckling reflex. Would recommend this product to any and all parents. Easy to clean

I was on the fence about these as I thought no way that would be so heavy for a baby to hold, once they start holding bottles but in all reality its not much heavier than his normal bottle. I love how they clean so much better and doesn't have the nasty plastic that breaks down time and time again. Plus the plastic ring with the cap attached is amazing and a must for us on the go moms!

My baby boy is exclusively breast fed and when I had to run off for the first time when he was 7 weeks, he took it without a problem!

My son needed the next size up and they let out enough flow for him.

Convenient and vented. My son took to them just fine after being EBF

We LOVE our mason bottles! We started with the diy kit since we already had a lot of jars and rings and have added nipples and sleeves as needed. Our daughter took to the bottles easily and I love that at the end of this journey we won’t have a bunch of plastic bottles with no other use. The nipples are easy to clean, hold up well, and allow our baby to go back and forth between bottles and breast easily.

My baby has only used mason bottle products for bottle feeding! And she has taken to it so well. I just bought my niece these nipples. And this was the only bottle she would use after breastfeeding exclusively for 6 months. Love the sustainability of thirds products. Really easy to prepare bottles with the metal mason tops.

We love using our Mason Bottles! Before our little one was born, we knew we wanted to be more green and also had a ton of mason jars. It only made sense to try out the silicone nipples to use with our jars and we're so happy with them! Super easy to use!

I love using these. They are so simple to use with my mason jars. I didn't realize the little heart shapes were vents until I made a bottle. I plan on purchasing the lower flow rate nipple when I have my next baby.

Got the wrong size

Had one that leaked thru the vent, contacted Mason Bottle and they sent a replacement pack right away!Really appreciate the great customer service!! Love all the products we’ve used.

There were many conflicting reviews that made us apprehensive to try this set up and we're just in love! Best option out there for our little one. Thanks!

We had a hard time finding a bottle that my breastfed daughter would take. We finally tried Mason bottle and it’s been the smoothest feeding ever since! I love that I could just buy the nipples at first and use it with a ring and Mason jar I had. Then once we figured out it was the one we bought the whole set! Love that they are glass as well of course, I would never get anything else.

Love that i can use Mason bottles for my bottle. The nipples are great for every stage!

Absolutely love the bottle nipples. Was Using a different glass bottle before and they would always leak. The silicone is such high quality and really easy to clean

Flow feels pretty fast. Probably could have used slow flow for my 5 mo old.

I enjoy using my own jars for baby. The nipples work well. Everything is easy to clean.

Our baby has been a store-bought mason jar with the Mason bottle nipples and sleeves and is loving them! The metal rings don’t fit well with the nipples so I purchased the plastic rings and the problem was fixed. Highly recommend any of these products!

I love being able to use glass jars and the slow flow nipple works great for my little one. My only complaint is that after awhile the ring doesn’t tighten down properly and will leak a bit. The metal jar rings work better but don’t have the lid cover for transport.

Flow feels pretty fast. Probably could have used slow flow for my 5 mo old.

Amazing products!, I wish I could have found them for my own kids, but my grand daughter will use them, so I'm happy! 😍

I love that I can use these with the mason jars I already have. Glad I can cut back on my plastic use, especially with my newborn.

Love that i can use Mason bottles for my bottle. The nipples are great for every stage!

The whole experience from purchasing to arrival was excellent! The quality of everything is amazing and it is the only bottles my daughter will use for my 1st granddaughter due July 1stt 2025!!!

Our son was almost 9 mo old when we got him these nipples and they were slower than we hoped they would be unfortunately. He still drinks from them, it just takes much longer than some of his other bottles that we have.

Excited to try these out but so far love them.

I've used mason jar nipples with both of my children, and I'm so grateful that they've worked well and enabled us to use mason jars, as opposed to standard plastic bottles.

The only nipples baby will take ! Finally found one, give it a try really ! I hope it works for everyone else just as well .

We are very excited to use mason bottles for our baby, and used them for our first child and they are adorable, functional, easy to use. Only feedback/criticism I would have is that it gets tricky to keep track of which nipples are which size as your baby starts moving from the slow to medium to fast or flexible flow, they all look identical and arent labeled except for the small which has an "S" on it. I'd suggest adding a similar letter or identifier to the rest of them too so when sleep-deprived, busy parents are grabbing bottles they can get the right ones :)

Love this product. I wanted glass bottles for our daughter and this allows us to have that while also reducing our waste as we can use the mason jars for years to come after we are done bottle feeding