I conducted the same experiment just using the formula for determining volume of 
a sphere: (there are printed samples of the sphere size in the Hollister 
literature that accompanies the marbles). 

Volume of a sphere: 4/3 Pie(3.14) r(radius) cubed (don't know how to type that 
one!)

I came to the same conclusion you did, the shooter marble is a better reflection 
of the 5-7 ml capacity.

However, I have been working in the field of education for sometime. These are 
visual aids, people use these types of aids to reflect thoughts, ideas and 
concepts. They don't have to be perfect, an infant's stomach certainly isn't a 
sphere, nor is it white...etc. etc. So if you see where I am going with this I 
don't think it is a big deal, they just illustrate the stomach is tiny! I wouldn't dismiss using the tool, if someone updates
it that might be ideal.

The reason I performed the experiment is my dept. got a note from a nurse who 
felt use of the visual aids was deceiving to parents because her lab experiment 
conducted one slow evening at work confirmed our suspicions.

We all talked about it, she agreed, we're not using the belly balls as measuring 
devices! Just a simple visual illustration. Precision isn't a requirement.

Michelle H. Kinne ICCE CD(DONA) CLE
www.DoulaDiva.org


I did a little experiment with water and a medicine dropper and it 
looked like 5ml would fit better in the shooter marble.? If this is 
correct, than even LLL has the wrong examples on their website.

Can anyone help clear this up?

Thanks,
Jeannine Jacobs, CLE






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