My doctor asked me at Nathan's 2-month appointment if he'd started squealing yet. He hadn't then, but he discovered the squeal capability in the next couple days. It took until a couple days ago before he discovered the components of "duration" and "volume level" and how to maximize them.
It's cute now to hear him squealing away to himself like a stuck pig as he lies on the floor or sits in his exersaucer, but I can tell already that we will quell squealing when he's a toddler; the boy is loud. I feel like I'm watching a child discover a new toy; they poke and prod it, suck on it (if possible) and determine how it responds to various changes in circumstances - only Nathan's new toy is his voice. He seems pretty pleased with himself and how he's able to duplicate this noise that gets him attention and laughter.
He still loves music (singing along with his own baby noises and squeals when I sing to him) and physical actions (the arm motions on "Deep & Wide", pattycake, etc.). He desperately wants to see things and move. He regularly tries to pull himself up with his stomach muscles; and if you burp him you'd better not have him facing a chair back - too boring.
I had the first mommy-scare of my life last week... While out shopping with my mom, I had Nathan in the front-carrier facing out. The weather was nice, so I decided to walk from Best Buy to the Starbucks just across the street. I was good and made wise decisions (even hit the 'walk' button rather than dodge traffic), but tripped and fell forward ~4 feet from the curb. The pavement dipped down - and that's where I went: down. I landed hard on my knees and one hand. The other hand immediately grabbed Nathan to keep his little face from grinding into the asphalt; I caught him just a few inches away from contact with the pavement. Even now the thought of possibly scraping his nose or cheeks makes me feel sick inside. He was fine, despite some dirt stains on the toes of his sleeper, but it scared him enough that he started crying. I picked myself up and limped the rest of the way to Starbucks, doing my best to soothe my screaming son the rest of the way. He had a sober expression on his face the whole time we were at Starbucks.
I hope I haven't given his little mind fodder for nightmares because of my clumsiness.