How Do Toy Baby Bottles Work?

Do you remember those magical water bottles that would seem filled with milk, but, when you flipped it upside down, the milk totally disappeared? Yeah, we were fascinated by it too. But, as it turns out, it’s actually a pretty simple magic trick. 

So, how do toy baby bottles work? Well, to know that, you’re going to have to spend a few minutes with us in this discussion. If you too, like many of us, have been fascinated by this magic trick, you have come to the right place. 

We have explained the whole phenomenon in this very discussion. On top of that, we have also explained the construction details of those particular magic bottles. That’s why you should hop on to this journey of ours. Here, we’ll fully unravel the ins and outs of those baby toy bottles.

So, let’s get started!

How Do Those Magic Baby Bottle Toys Work?

What Seems To Happen:

To simply state the visual details, there are special types of baby milk toy bottles found in all local stores. In these toy bottles, the milk appears to be filling at least half the space of the bottles. But, things get interesting when you put the bottle in an upside-down position. 

In the upside-down position, the bottle’s milk completely seems to disappear. If you see a half-filled bottle getting empty right in front of your eyes (without the milk leaving the bottle), it will surely baffle you for a few seconds. That’s what happens to everyone as well.

After seeing that the milk has disappeared from the bottle ( when it is put upside down), people’s minds quickly look for an answer to this mystery. 

But, any normal person will never be able to discern the trick behind this phenomenon (unless they find out the explanation behind this). So, what’s the explanation behind it? Let’s see below.  

What Actually Happens:

Actually, the toy milk bottle is not a normal bottle at all. It’s specially made with a double-layered construction. In simple terms, imagine putting a smaller bottle inside a larger one. 

Yes, this is how the construction of this toy milk bottle is. It is constructed with two layers of plastic. As a result, there is a narrow gap between the two layers of plastic. 

Now, when a little amount of milk is put in that narrow gap, the milk quickly spreads around the circumference of the cylindrical bottle. That, in turn, makes it seem like the milk is filling the bottle (but in reality, the central space of the bottle is kept empty).

Now, when you put the bottle in an upside-down position, the little amount of milk (that was poured in the narrow gap between the two layers) runs into the bottle’s cap. 

Finally, since there’s so little milk in the bottle, the whole amount easily fits in the bottle’s cap (when the bottle is in an upside-down position). As a result, it seems like all the milk in the bottle has fully disappeared into the bottle cap.

And, there you go. Now, you know the secret behind how toy baby bottles work. The whole mechanism is not that complicated at all, right? 

Is The Milk Inside The Bottle Real Milk?

Although the toy bottles are called “milk” bottles, the white liquid inside the bottle does not necessarily need to be actual milk. Because actual milk will decompose and get rotten over time, actual organic milk is not put in these toy bottles. 

That’s why, as we have seen in a real scenario, kids can play with these toy bottles for months (up until the point when the bottle is broken).

Since the white liquid inside the bottle doesn’t need to be milk, it can be any chemical that is not hazardous to kids. Any chemical that will not get rotten our time and can retain its white color for several months can be filled in these magic bottles. 

Therefore, there’s no way to tell which chemicals exactly are put inside these toy bottles by their manufacturers (since there’s also a possibility that different manufacturers put different types of white chemicals ). 

What Are The Toy Bottles Made Of?

The bottles used in this magic milk toy are made from plastic. Since plastic cannot ever be decomposed, it is the perfect material to be used for kids’ toys. On the other hand, there is no health hazard for kids who put plastics into their mouths (unless they swallow it).

The plastic used in the manufacturing of these bottles is visually transparent and can withstand the high impacts of accidental drops from the hands. In most cases, thermosetting plastic is used in manufacturing these bottles so they are not elastic in nature (instead, these plastics are fully hardened).

Frequently Asked Questions

1. What to do if my child accidentally drinks the milk from the toy bottle?

In case a child accidentally drinks from the toy bottle’s liquid, you’ll immediately have to take the child to the hospital. 

But, as first aid treatment, we recommend making the child drink lots of water. Even if the child accidentally drinks a little portion of the chemical milk, if a lot of water is mixed with the chemical in the stomach, hopefully, it won’t be able to create any permanent problem.

But, in case the child drinks a lot of that “milk”, the best way is to reach the hospital as soon as possible.

2. Is it safe to let my child play with these toy milk bottles?

Although the purpose of these toy milk bottles is to show off a simple magic trick, you can let your child play with them. 

Generally speaking, the material that is used to manufacture these toy milk bottles is very resistant to shatter. So, your child shouldn’t be able to break the bottle very easily (and drink the liquid inside the bottle).

But, if your child has a tendency to put toys into its mouth, we recommend not giving this toy milk bottle to your child. 


Well, there you have it, people. Now that you have got a clear understanding on how do toy baby bottles work.

To sum it all up, the toy milk bottle is supposed to be a magic trick that is entertaining to children. These little mystery tricks are little tools to pique the children’s curiosity. So, it’s a good idea to show off this magic toy milk bottle to your children and later on, let them know the secret so she/he understands how all magic tricks work.

At last, we hope the best for you and your children. See ya!

Sarah, a health writer and editor since 2014, is an adoring wife and dedicated mother to 2 daughters and 1 son. As the creator of Babies Plannet, she combines her extensive expertise with her maternal dedication to provide essential care and safety advice for infants, nurturing their well-being and happiness. Her writing explores topics like fitness, pregnancy, and women's healthy lifestyles.

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