MIDORI (9 months old, female) & her parents

---

START 　

　 　

She isn't interested in TSI at all.   

after 5 min

. 　

She swings TSI without sucking. 　

　

after 20 min

　

She begins sucking and seems to sense to ring sound by myself.

　

after 22 min

　

Interaction between parent and baby succeed !! 　

　

after 24 min

　

She continues sucking with absorbed interest.