The physical review of a diaper is done to help ensure the sturdiness of its construction while a child is wearing it. Manufacturers have studied the behavior of diaper-wearing children, and know that they may pick and pull at their diapers. But, diaper companies have consulted experts to learn the amount of force babies/toddlers can exert to pull on small objects. They have also studied which kinds of objects would be choking hazards.
Common areas of study include:
- Avoiding sharp edges that scratch skin
- Avoiding excessively tight parts that could leave red marks
- Avoiding fastening tabs or tapes that can be pulled off and eaten
- Avoiding elastics that can be pulled out
- Strength of the bonds between diaper components so they cannot easily be pulled apart
- The effects of aging on diapers