Do your Sippys have a Valve?
Our sippy cups come with a clever little valve at the top of the straw, specially designed to keep leaks in check—especially with cold or room temp water. Now, here’s the thing: if we made the valve super strong to handle warm liquids, bub would need some serious Hulk strength to sip from it. And nobody wants sipping to feel like a workout, right?

So, we’ve struck a balance with a “just right” valve. It’s strong enough to prevent leaks with cold water, but still easy for your little one to sip without any struggle. Just a heads-up: when it comes to warmer liquids, a bit of pressure can build up, which might cause some liquid to come out the valves at first. But we’ve done our best to give you the best of both worlds!

My sippy cup is leaking—help!
Don’t panic, we’ve got you. There are just four sneaky spots to check when your sippy’s sprung a leak: the O-ring, the straw valve, the air valve, and the straw upper skirt. These are the only places with a connection or hole, so if all’s good there, you’re golden! We’ve made a little video here to guide you through the troubleshooting process—because we’re helpful like that. And don’t forget to check out the "Does your sippy have a valve?" FAQ above for more info.

Can I use warm liquids in the sippy?
You sure can! BUT just a heads-up: warm liquids like to build up a bit of pressure, which can sneak through the valve. The hotter the liquid, the stronger the pressure—so while it’s still fab for warm drinks, you might see a little more drip action. And don’t forget, 37°C and under is the baby safe temp'.

Can I use formula in the sippy cup?
Formula in a straw cup? It's like dipping your toes into a pool of possibilities, but we gotta be real here – it's not exactly our top recommendation. See, formula can be a bit of a rebel. If it's not dissolved properly, it can cause trouble and clog up the straw faster than you can say "milkshake." So, while we're not here to rain on anyone's parade, we've gotta say it: using formula in the cup is entirely up to you. Little Stackers takes no responsibility for any formula-fueled adventures. Safety first, folks! And if you do take the plunge, just give it an extra scrub for good measure.

Why is the straw coming away from the weight and connector?
Oh no, that’s a bit annoying! First, make sure the weight, connector, and straw are all totally dry before reassembling – a dry straw is a grippy straw! Also, be mindful of what you wash your sippy cups with. If they go through the dishwasher with anything oily or greasy, it can cause some slippage, so make sure everything is squeaky clean and dry. And hey, don’t forget we sell replacement straws (especially handy if your little one’s been giving them a good chew)!

Why is the teat collapsing in on my baby bottle?
Ah, the infamous teat collapse – it's like finding the perfect balance between snugness and airflow. When screwing on the nipple and ring cap, remember not to overtighten. Just tighten it enough so the bottle doesn't leak when tilted on its side. Overtightening can block the vents and cause the teat to collapse.
Before assembling, give the integrated vents a gentle pinch with your fingers to ensure they're open and ready to go. A little airflow goes a long way for a happy baby and a happy bottle!

What teat flow should I choose?
We understand that sometimes it’s easier to see than to read. That’s why we’ve put together a handy little video walking you through our teat flow rates. We even compare them to a well-known global brand (because let’s face it, that’s what most people are used to).

If you’re thinking about making the switch to Little Stackers, this video has all the information you need to choose the perfect flow.

How can I tell what teat is what teat flow?
It's like deciphering baby hieroglyphics! Look for the microscopic writing on the teat –it's there, we promise. Find the sneaky last letter and ta-da! S for slow, M for medium, and F for fast. Slow for the teeniest sippers (0-3 months), medium for the in-betweeners (3-6 months), and fast for the turbo-chuggers (6+months). But remember, every munchkin marches to their own beat, so our flow guide is more of a gentle suggestion than a rulebook.

HANDY HANDLES
How do I put on the Handy Handles
Pop those handles on like a pro. Start from the bottom, slide them up, and twist in the anti-clockwise direction to hear that satisfying click. You're all set for easy peasy bottle feeding.
Remember, they fit both cup sizes and can be used on both the baby bottle and sippy cup attachment.
How Handy!

GENERAL
Are they dishwasher safe? 
You betcha!

Our bottles are like the caped crusaders of the dishwasher realm – sleek, smooth, and ready to fight grime. Unlike those curvy, ridge-riddled bottles, ours are designed to keep dirty dishwasher water at bay, ensuring every feeding is a hygienic delight. So toss 'em in with confidence – clean, sparkling bottles are just a cycle away!

Are they microwave safe?
Sure Are!
Our cup base is microwave-safe, making heating up liquids a breeze. For the baby bottle, the whole thing can go in if that pleases you. But hold on a sec – if you're using the sippy lid attachment with the weighted straw, keep the straw out of the microwave. Just nuke the liquid in the cup and pop the straw on when it comes out. Metal in the microwave spells trouble! Safety first, always! Just a heads-up: for warming liquids, follow our handy guide of approximately 20 seconds per 180mls in the microwave. Easy peasy!

Free (yep!) standard shipping on all orders over $75

Flat $10 fee for standard shipping for orders under $75

Flat $15 fee for express shipping

As a small (but growing) Aussie business trying our darndest, we promise to do our absolute best to pack and ship all standard shipping orders within 2 biz days—like so many other things in life, however, there are no guarantees. Knowledge is power, friends; so check your tracking for updates.

Opt for the express route? We know you and your bub probably needed your order, like, yesterday, so Little Stackers will ensure it makes its way out of our warehouse within a quick 24 hours (excluding weekends and public holidays, of course), Once it's on its speedy way, the express delivery team will handle the rest!! Depending on your location, be on the lookout for a typical delivery time of 1-2 days after the Post receives our package. Remember how we said knowledge is power? So make sure to check your tracking.

As for their origin, all Little Stackers orders go on their merry way from Melbourne.

We get it—online shopping is way different from the old school brick-and-mortar days. That’s precisely why we’re tickled pink to honour returns within a 14-day time period with just a few teeny tiny conditions:

  • We only accept returns for brand spankin’ new products: that means unused, undamaged, unsoiled and in the original pristine packaging. Looking to return something that doesn’t fit this mould? Our apologies, but we simply can’t accept it and will ship back anything of the sort to customers at their expense. 
  • All items must be shipped back to us within 14 days of receipt. To where, exactly? “Returns at Little Stackers, 15-21 Bellevue Cres Preston 3072.” If you happen to change your mind and want to return a product(s) after this 2-week window closes, refunds are unfortunately not available (soz).
  • Less than thrilled with your Little Stackers purchase? Shoot us a quick email so we can make it right! Include your name, product name, invoice number, reason for return and if you’re after a replacement, credit or refund.  Those seeking a refund will receive a credit via the same payment method used to purchase within 7 days after we receive the product (yay!).
  • Postage costs are unfortunately not refunded, extending to any orders that enjoyed free shipping as well.
  • Since customers are responsible for shipping costs, allow us to make your life just a wee bit easier: we recommend shipping via Registered or Express Post, as you assume any risk of lost, stolen or damaged goods during transit. Little Stackers PTY LTD is not responsible for anything that happens to parcels in transit to us.
  • Oh! One more thing; all sale item transactions are final, with returns or exchanges not available for these items.
  • Get it? Got it? Good Great! Happy shopping xx

We’ve got your back and will do our best to help! Email us at info@littlestackers.com.au with your relevant order details ASAP. If your order is already too far along in the system, there may be nothing we can do. We’re glass-half-full optimists, however, so shoot us an email and let’s see what we can do—with no guarantees (just being honest here, friends).

Of course! We aim to please…

  • Always, and we mean always, clean our products before first using them (and again after every use, if that part’s not obvious).
  • Using a teat? Give it a good sanitise in boiling water for five minutes prior to first use.
  • Never leave the teat, spout or straw in a disinfectant product for longer than recommended. Why? It might weaken the product.
  • Dishwasher safe (top rack only) or hand wash in warm soapy water and rinse thoroughly. Do not use abrasive agents or scourers-they're no bueno.
  • Some liquids/foods may discolour this product. This won't impact performance; it just won't look as pretty.
  • Don't turn teats inside out for cleaning, please.
  • Thoroughly wash straws with soapy water after each use, using your handy-dandy straw cleaner to keep them clean both inside and out.

Your wish is our command…

  • First up, this product is not a toy. So only let your little ones use it under adult supervision.
  • Give our products a good once-over before using them, pulling the teat, spout and straw in all directions.
  • Important! Don't use with hot or carbonated drinks. Or with juices containing pulp. And don't use the straw with formula-that's a no no. 
  • Make sure to remove any and all packaging before giving our products to children.
  • Please, please, please don't microwave the sippy cup and straw.
  • Hang onto your instructions, which come in every pack, for future reference (just in case!).
  • It's never a good idea to let kids walk or run with our products; a stationary kiddo is a safe kiddo.
  • Never use feeding teats as a soother/dummy/pacifier.
  • Always inspect the product before each use and consider it rubbish if you spot any signs of damage or weakness.
  • Individual parts may pose a choking hazard for little mouths.
  • Never attach the product to cords, ribbons, laces, or loose parts of clothing to avoid the risk of strangulation.
  • It’s common practice, but we'll say it anyway and shout it from the rooftops—always check the temperature of the product and contents before feeding. Microwaves are often deceptive, so be careful to avoid burns.
  • Always stir hot contents to ensure heat is distributed evenly and perform temperature testing before handing over our products to your child.
  • A comprehensive safety and warning list is inside every pack for handy reference (or check it out here!).

At Little Stackers, we’re all about making your life easier. That’s why our bottles are made from high-quality, BPA-free polypropylene (PP) and independently tested by SGS, one of the world’s leading inspection, verification, testing, and certification companies.

Our bottles are confirmed to be free from harmful toxins such as BPA, phthalates, and PVC. Plus, they meet stringent Australian safety standards.

Get in touch

Still got questions? Shoot us an email at: info@littlestackers.com.au