by 
The Curious Bag
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<h4 class="dechead">On One Hand: Recognized Benefits
In many ways, Munchkin sippy cups are convenient, safe and easy to clean. There are no health risks involved in using them because they are made of polypropylene, silicone and polyethylene. They do not contain bisphenol A, commonly abbreviated as BPA, a chemical compound that is thought to cause health problems and is used to make some plastic products. The sippy cups are dishwasher safe and can be disassembled for easy cleaning.
On the Other: Functional Issues
Some children get upset with the slow flow rate, especially when they are really thirsty. It is true that this cup does not leak when left on its side; however, when shaken upside down, it does.
Bottom Line
Overall, Munchkin sippy cups can be a good purchase. They are inexpensive, fun for kids, safe and don't present a health risk. There are few negative issues associated with it, and these are minor functional problems.
Source:
Green Baby Guide: Affordable BPA-Free Sippy Cup Solutions
Green and Clean Mom Organization: BPA-Free Munchkin Sippy Cups
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