Frequently Asked Questions and Instructions

Check out this quick instructional video for proper assembly.
**Pay close attention to the Air-plug® assembly, always use a flat surface, Do not assemble the Air-plug® by hand**.


If you are using the Perfe-latch® nipple:

Enter your email and register to hear about latest tips, events and freebies:

ALWAYS feed your baby in an upright position

  • Find a comfortable chair or sofa you can sit on, be sure to know that you can rest your back if needed. If your baby is restless he/she may stretch or arch without warning, be sure you can hold him if this happens.
  • Sit the baby on your lap and hold the back of his head with your hand or let baby rest on your forearm while you hold his torso and keep him safe. The more upright you can hold him the better, this way gravity keeps the food (and acids) in the stomach while he feeds.
  • Hold Bare in upright position as well, with the nipple pointing up. Bare works with suction as opposed to gravity and can feed in any position. YOU DO NOT NEED TO TURN BARE UPSIDE DOWN TO FEED.
  • Let the baby create the suction in order to feed. This way he can control the flow and pace of which he feeds, thus preventing overfeeding and/or choking.
  • See more videos:
Upright feeding position

Gassy baby feeds in upright position

Customizing your Bare® Air-free so it adapts to your baby’s feeding habits

Did you know you can customize Bare Air-free to match the flow and let down of your own breast to further prevent nipple confusion? This customization also works with your bottle-fed baby, not all babies have the same suction range, therefore you can get Bare® to adapt to your baby’s feeding habits, not the other way around. Here’s how.

The Air-plug® doesn’t automatically move as my baby feeds:

  • Our silicone Air-plug® has been regulated to mimic breastfeeding as far as “resistance” while applying suction. Although this range is average, there are babies that will have stronger and weaker suction that fall outside the range. You can customize Bare’s sucking resistance by using water or milk (breastmilk or formula) as lubricants. Simply, before you install the air-plug® wet the outer edges that touch the inside of the bottle with milk as well as the inside of the bottle and assemble, push the air-plug with your thumb, take out and repeat about 2 or 3 times. The oils in the milk will make the air-plug very slippery and will move easier and with lower suction. If you see the air-plug® moving too easy and your baby is getting too much milk, then wet the air-plug® with water instead.

If your baby gets too much milk:

  • To “test” if you assembled Bare correctly, turn it upside down after expelling air. If you have drips from the nipple, make sure that the air-plug is in straight, the nipple is installed correctly and collar is adequately tightened (See video).
  • If any of these pieces are not properly installed, you will have air leaks acting like an air-vents leading to free feeding.
  • Both nipples, Perfe-latch and Easy-latch have Flow-Control technology and the flow goes from zero to fast flow depending on the baby’s suction.
  • You should always feed baby in upright position and let him control the flow with suction.

Warming up Bare®:

  • Fill up a bowl with tap water on the hot setting (tolerable to the touch),
  • Dip Bare® in the bowl for a few minutes.
  • Do not use bottle warmers. Do not heat with microwave.

Why is the Nipple leaking and collapsing?:
  • The nipple may collapse if the Air-plug is not moving as it should, please see above to fix.
  • Make sure that the nipple’s outer edge overlaps the top and bottom of the collar, as shown in picture.
  • If bottle leaks around the nipple, inspect the underside of the nipple to look for gaps. Using your finger, push the nipple’s outer edge against the collar in all directions until it fully overlaps the collar without any gaps.
correct nipplenipple assembly

My milk spilled from the bottom of the Air-plug:

  • Be sure to lay the Air-plug® on a flat surface to install. When placing the bottle over the Air-plug®, push the bottle until it touches the table or counter top (flat surface). This will ensure that the Air-plug® is straight inside the bottle. **Do not assemble the Air-plug® by hand**
  • When pushing Air-plug® to expel air, make sure it is straight inside the bottle. Always use your thumb and press the thumb disk located at the bottom of Air-plug® to push and expel the air. **Press slowly but firmly, like a syringe.** Too fast may lead to spills. Pressing from any other point, other than the center may lead to spills. Don’t use two fingers, use your thumb. Please “practice” with water and stay near the sink before you start using Bare®.
Bare bottles leak is fixed

I see air trapped in the nipple:

  • This is an indication that the air-plug may be sliding down on its own, which shouldn’t happen. To fix this, expel the air out and let a little squirt go thru the nipple wholes. Due to the airtight environment, the milk will gather around the nipple wholes and act as plugs preventing any air from going in.

I have the Aqua Air-plug:

  • Our Aqua Air-plug has been discontinued and replaced with the new Silicone Air-plug. Please contact customer support at [email protected] for more information.

Use as recommended only. Avoid use of steam such as, steam sterilizers or steam bottle warmers.


Bare Parts



Fill 3/4 of a clean, large pot with water and heat to boiling. For your protection, use tongs to place in and remove parts from boiling water. Boil parts for 5 minutes. Sterilization is recommended once a month.

Bare Care 5 Only boil-sterilize parts.

Avoid steam or microwave sterilization methods.


Installing Nipples

wash-hands1. Always wash your hands with soap and water before handling bottle parts.
installing nipple2. Push the nipple through the collar & gently pull in different directions until ridge clips evenly over collar’s edge.


Bare care 1If hand-washing, use a soft sponge and mild soapy water to wash each part. Avoid bottle brushes, solvents or abrasive cleaning agents. If you use a dishwasher, be sure to place the items in top rack only.


Bare Care 3Avoid cracking, deforming, scratching or denting bottle parts. Damaged parts may cause leakage of contents. Discontinue use and replace any damaged parts immediately.


Bare Care 4 Bittylab recommends replacing the Air-plug® and Nipples every 6-8 weeks to maintain optimal performance and hygiene.


We suggest you practice assembly steps before you start using your new Bare®.

lay parts on flat surface

Place all parts on a flat surface, facing up. This is necessary to ensure that the Air-plug® enters the bottle straight and seals properly.

air-plugAir-plug® should sit on its flat base in order to be installed.
remove footMake sure to remove foot before installing Air-plug®.
step1Fit bottle over air-plug Air-plug® & push down to install.
Do not insert air-plug by hand Do NOT insert Air-plug® by hand:
step2Press bottle evenly & firmly down over foot. The foot will raise the Air-plug® to proper height inside bottle, ready to hold liquids.
step3Fill bottle with milk & close with nipple/collar.
step4Slowly & evenly push Air-plug® up to expel the air.
Do not insert air-plug by handUse the flat dot to push located at the bottom of Air-plug.


Bare feedingFeed baby air-free milk, or allow baby to feed himself/herself in any position.

Never push Air-plug® while feeding.
Do not leave baby unattended while feeding.

test milk before feeding ALWAYS test liquid temperature on wrist before feeding. Bare® is freezer & microwave-safe, see warnings about microwaving baby food.



1. Twist the cap to expose nipple. If bottle is empty go to step 3.
push nipple to open2. Cover the nipple’s orifices with your finger and push in a couple of times to bring fluid level below bottle’s top edge.


twist open3. Twist nipple/collar counter clockwise to open. Discard contents.



For your child’s safety, read the following WARNING

  • Always wash your hands before handling any feeding product.
  • Always use this product with adult supervision.
  • Do not leave baby alone with any feeding device.
  • Do not let baby walk with the bottle.
  • Microwave heating of liquids may cause hot spots that can burn baby’s mouth.
  • Always test liquid temperature on inside of wrist before feeding.
  • Never use Perfe-latch® or Easy-latch® nipples as a pacifiers.
  • Always use this product as directed.
  • Always make sure all parts are thoroughly cleaned and dried before use.
  • Inspect nipple prior to every use. If you see any signs of tearing, cracking or change in shape, discontinue use and replace immediately.
  • Prior to every use, inspect Air-plug® for cracking, or any change in shape. If you see any of these signs, discontinue use and replace immediately.
  • Prolonged or continuous fluid sucking can cause tooth decay.
  • Only use Bare® parts with Bare® bottles.
  • Never push Air-plug® while feeding.
  • Keep all parts out of reach of children when not in use.

Bittylab is committed to produce the most innovative, functional and highest quality baby products available today. Our products go thru rigorous testing to meet the feeding habits of an average breastfed and bottle-fed baby before releasing to market. However, if you believe you received an unavoidable factory-defected piece, please see the terms page for our 90-Day warranty on all parts and contact us immediately at [email protected]. The tips above usually resolve most issues.