A combination of an infant article for use by an infant, having an external surface, comprising a first material, for example a backsheet material with a testable property, such as stretch or softness, the infant article being comprises in a packaging material； and a separate first test article, for testing by a care-taker and for subsequent use by an infant, the test article having an external surface comprising the first material with the testable property. The test article is for example curved and/or three-dimensional, having an internal volume comprising a resiliently compressible material, such as a soft infant toy or pillow.
