It seems a couple of the puppies are beginning to notice noises. They pick up their heads when I talk to them, and some will startle at sudden louder sounds
In this video (about 2.5 minutes long), I call to the puppies to see if they'll respond. I use a higher-pitched voice (lol... it's my "puppy voice" and quite silly, so please ignore it!) because they seem to be able to hear higher pitches to start.
Note that they're also becoming interested in people (namely me in this video) and are starting to wag their tails. :) Their interest in and affection for people is natural to the Labrador breed and will increase with their abilities (developmentally) to show that affection.
Heehee... looks like they have a good start! (Puppies!)