Receptive language, which is understanding language, is discussed in this video.  Receptive language can include reponse to name, following commands, answering questions, etc.

Milestones 0 to 5 Years

Speech and language milestones from birth to 5 are discussed in this video. Categories such as expressive language, receptive language, play, etc. are talked about. Perfect for early intervention providers or parents who are just curious about speech and language development.

Here is a short description of the Rossetti Infant Toddler Language Scale. This test is used by speech therapist for early intervention. It is broken into categories: interaction-attachment, pragmatics, gesture, play, language comprehension, and language expression.