Preschooler using referential listing grammar in sign language

The bilingual preschooler Juli (age 3;6) listened to me telling a story in ASL at bedtime as I read the "Sleeping Beauty" to her at nights. She picked up me using referential listing when I talked about three fairies and their names.

A few nights later, Juli told me about her day at bedtime. She signed ix-me saw firefigther truck and ambulance, siren ix-there downtown. Three: 1) firefighter 2) ambulance 3) police. Firefighter (truck) stopped, siren none. Helps people. Water dangerous!.

Several days ago, I used the listing of three civil services: firefighter, police, and ambulance. I was surprised that she remembered this only once and used it herself later on.

Indefinite Pronouns in sign language

One night at age 3;7, I stood in the bedroom to see that Juli got in her bed. As she passed the doorway, she paused. She signed, ix-me forget something. I didn't get it at first because I hadn't seen her using "something" before. She repeated it. I asked what did she forget? She replied, ix-me forget to-bathe. two-us (you and me) go-to bath.

That same day, Juli signed many, many mice. The indefinite pronoun "something" was something new she used; however, other common indefinite pronouns that she routinely used were: #all, another/other, and none/nothing.

Around that time, Juli was also seen using the signed word first. E.g. first put-on shoes.