Cooing emerge at about weeks four to six. Canonical babbling (repeated syllables) appear at about 6-7 months. Infants usually produce their first words when they approach their first birthday.
Between babbling at 6-7 months and first words in reference to objects or people at around 10 months, infants tend to overgenerize their first words to objects or people. For example, like many infants, Juli not only vocally called me "mama" but also called her father "mama". In sign language, Juli called both dogs and cats as "dog" until late 9 months old.
The ASL-spekaing baby Juli (age 0;10) stood on her own periodically as well as squatted a few times on her own. She walked while pushing the chair. Pointing was all the rage that week. Juli grew more interested in pointing and naming.
Overgeneralization of words gradually diminished. First words became more categorized.
On several occasions, as I held Juli (0;10) in my arms, she pointed toward the DVD player and produced a recognizable ASL word music that I clearly noticed. Context helped.
Prior to this, I had signed music in the past weeks, especially every time I turned on the vinyl record player. And, every time I started the vinyl record player, Juli often pointed toward the DVD player on the shelf. That is, she categorized the vinyl record player with the DVD player under the category of music.
The phonological movement of the ASL word music was well identified, which was distinct from the movement prime of done/finish.
One day, Juli looked at the artworks on the wall. She produced the "sae" babbling syllable (the same movement from the past in reference to "art") and then she turned around and pointed toward the DVD player and produced music (usually left-handed).
During the first week at 10 months old, I described how I first noticed the emerging referential ASL word music that Juli had produced. Sure enough, in the second week it had became a clearer reference in different contexts. Signing music was the rage that week.
Every time I turned on the record player, Juli produced one-handed music without using the base (arm). Likewise, Juli pointed toward the DVD player and produced music herself.
In a new context, when we entered a gallery room at the city's gallery one day, Juli repeatedly produced music. There was music in the gallery room.
Toward the third week (m11w3), I paid attention to Juli's babbles and emerging words more closely but often found myself dismissing Juli's clap-like or clapping babble.
At mealtimes I found Juli often produce a "more" babble lately and I began to realize that I often dismissed it but then I began to pay attention to determine the contexts.
Each time I gave Juli a few cut pieces of the grape, she ate them all and then produced more. I saw this somehow in a more linguistic light more than just clapping.
That early week the moment I put Juli in the highchair, out of the corner of my eye, I caught her uttering eat -- 5 handshape onto the mouth a few times. It was a distinct production in the right context.
It was not the first time she produced it. I didn't take the first seriously until she produced something more than a second time. And I was also busy to take the first production seriously.
From there, Juli produced eat a few times, usually around in the kitchen.
By the end of that 11th month, Juli still produced the ASL word music which remained to be highly consistent with the referents in different contexts -- the portable DVD player, the record player, the playstation's music center, and other referents.
An usage of the ASL word finish/done had become clearer both in its reference to contexts.
Juli was seen producing eat (open 5-handshape tapping onto the mouth a few times), open 5-handshape tapping on the cheek (new, recently noticed), and a few other distinct, non-referential expressions or imitations.
Videoclip: Juli produced eat (beginning of the video). I introduced the numbers into daily life to Juli. Juli appeared to produce finish/done (end of the video).
Video clip: Juli seemed to be looking for a specific image, turning the pages and pages. She probably missed a page of what she was looking for. She then tried again and finally found a page of the cat.
At age 0;10, Juli's father reported that he signed cat along with the vocalized "meow". Then the chain reaction began as follows:
Juli picked up the book and opened to the page where an image of a cat depicted. Then she went on to another book and turned the pages till an image of another cat appeared. And, next one she opened another page that contained an image of yet another cat.
It showed Juli's ability in categorizing a group of the cats, despite that she sometimes tapped her hand on her leg (which means "dog") when referring to a cat.
Juli had a conversation moment with her Grandma Z and Grandpa K (who had a Movember moustache).
In a particular part of the video, Juli pointed (presumbly toward the record player). Z nodded, "mother will go there." Juli "danced" and produced the ASL word music.
Juli (0;11,0) used the ASL word finish/done in the right contexts last week. It became a bit clearer this week when Grandma Z came to look after Juli for a few hours and observed the same.
When I came back home, Z reported that she noticed Juli signing done/finish within the right context -- even just in a few hours of babysitting.
Z suggested "Look closely from now on." I told her that it actually had happened for quite a while.
The video clip above shows a literacy activity with the baby Juli.
Juli (m12w2) often produced three different ASL words that the parameters (handshape, movement, and palm orientation) of these words happened to be somehow similar: tree, finish, and music.
With the similar productions (e.g. twisting "5" handshape) for these ASL words, it appeared to be a little difficult to distinct one from the others, but they usually were easily determined within the contexts.
The ASL word music that Juli produced was easy to recognize. Another word finish/done was also not hard to identify. As for the word tree, it was sometimes uncertain, sometimes clear.
On the other hand, Grandmother Z had her own way. She said that Juli pointed and produced tree on several occasions when they looked out the kitchen window where they could see trees in the backyard.
(m12w3) One Sunday Juli uttered done/finish herself as soon as Dude turned off the vacuum and was about to unplug it. I didn't sign anything prior to that while I held her in my arms.
Juli regularly utters finish/done when she is full or doesn't want to eat more. Then her meal is over. I no longer can guess by her behaviors such as cleaning up the tray, dropping food on the floor or such.
Juli imitated (if not referred to a referent) some ASL words, such as snow (open hand moving down from up).