Choosing Bottle Sizes and Nipple Sizes for Your Baby


 

When it comes to bottles, bigger isn’t always better. As a matter of fact, same goes for nipples.
This post wraps up a four-week series about bottle feeding myths and FAQs. Today’s topic is one that was emailed into us a lot during the Kickstarter:
What size bottles and nipples do I need?
Note: If you missed the earlier posts in this series, you can check them out here:
Alright, so back to bottle sizes: first and foremost, you need to discuss the specifics of feeding with your pediatrician. How much your baby will take at each feeding will vary depending upon lots of factors. That said, you will still probably want to buy a few bottles before baby arrives, so here's what you need to know:
Most parents start off using four ounce bottles with their baby. Here are a couple things to keep in mind when using four ouncers:
  • Formula fed newborns will generally eat 2-3 ounces every few hours.
  • If you are pumping for a breast-fed newborn, the serving size can vary quite a bit. Kelly Mom has a handy little calculator you might want to check out.
  • By three months, your baby could be drinking as much as five ounces per feeding, but you may still prefer to use four ounce bottles for a few reasons:
  1. Breastfed babies drink less milk than formula fed babies because breast milk is a more efficient source of nutrition.
  2. It’s not recommended to reuse leftover breast milk from one feeding to the next, so rather than give baby a larger bottle he may not finish, you may prefer to give a smaller portion, and then refill it if baby is still hungry.
  3. 4oz bottles are lighter in weight, so baby might prefer holding that size as she becomes able to feed herself.
Once your baby outgrows the four ounce bottle, an eight ounce bottle is generally the next size up. You can wait and buy these as needed, but if you’re having a shower, you might as well get a couple of these as well.
When to Go From One Nipple Size to the Next
It's recommended to give your baby the slowest flow nipple that they will accept. This will give the baby the most control over the flow and help reduce the risk of upsetting their tummies. This is why we sell Mason Bottles and DIY Kits with Slow Flow Nipples. 
We also offer Medium, Fast and Fastest Flow Nipples, so that the bottle can grow with yours baby. As he/she gets older, you may notice they become impatient with the milk flow and you need to change to a faster-flowing size. When you do make the switch, watch for signs of gas or discomfort to make sure the milk isn’t coming out too fast.
Here's a summary of the sizes we offer and some guidelines on when to use them:
  • Slow Flow Nipples: 0-3+ Months ( or longer is baby is happy)
  • Medium Flow Nipples: 3-6 Months
  • Fast Flow Nipples: 6+ Months
  • Fastest Flow Nipples: 6+ Months and beyond. (These can be great for helping transition your baby to a sippy cup. They also work well for smoothies or other pureed foods)

 

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@faustisland just bought a pack of Mason Bottle Silicone Nipples, and then combined one with a classic blue mason jar she had at home. Extra adorable!

@valeryphalon.photography uses Mason Bottle Silicone Sleeves to make toddler training cups for her big girls.

@headygrimm gets a Mason Bottle + Silicone Sleeve ready for her little one. She got the whole bottle including the jar as part of the Essential Mason Bottle Gift Set, but you can also make your own with jars from home using the Mason Bottle DIY Kit.

@loveandcovenant uses the 8 oz DIY Kit in combination with their mason jars from home.

@eyecreate_ gave her little lade The Original Mason Bottle. The width of mason jars makes them easy to hold for little hands.

@headygrimm got the Essential Mason Bottle Gift Set for her little one. It comes with both size bottles, both sleeves, and set of extra set of Medium Flow Nipples.

Paola used Mason Bottle with her son Max from the day they brought him home from the NICU. Though he didn't take to the preemie nipples in the hospital, he latched onto his Mason Bottle immediately!

@sriesland stocked up on mason jars for pumping at work, then she got a Mason Bottle DIY Kit to turn those jars into baby bottles.

@MasonBottle we like to use our 4 oz. sleeves with baby food portions.





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"I wish I knew about these before I had my shower, and avoiding all the plastic bottles I ended up with. They will also make great glasses after bottle use is over. Also happy to see the Made in the USA mark on the product as well." -Cathryn

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"The next best thing to breastfeeding and the world's best shower gift! I love that I will never again have to buy a baby bottle because I already have tons of mason jars and they are so easy to clean. Our little guy loves his bottle!" -Susan

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"The nipples are very wide, like on an actual breast, and our daughter really liked them. Early on, she would suck really hard on the other nipples and make a very strange noise. As soon as we changed over to these her feeding became effortless." -Denielle




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