I delivered my bb in private hospital and I did not arrange the hearing test for her until she went to Mother Child Health Clinic. Yet, she failed the hearing tests twice. Then, they referred my bb to Child Assessment Centre for "ABR", but it needed to wait for about three months.
As I didn't want to wait, I went to take the test at St. Teresa Hospital and it cost about $1000 to do the ABR.
I think most of bbs did not have hearing problem. Yet, as a mother, I want to know the result as soon as possible. If paying a little money can save time, I will do so.