Yes! I found Birth Institute and the Bali program only a month before my departure date, so did not have very much time to prepare myself enough for the language.
Most of the women and families in our community did not speak English, and of course, all the communication between midwives and families were in Bahasa Indonesia!
I definitely encourage all the students who will be coming on to this program to at least learn basic language before arrival.
This will be incredibly helpful for your interaction and learning experience at the Birth Centre/community (you can better focus on your learning goals), and also for your everyday life on the island!