Infant devices

We are currently faced with a bunch of unknowns with our daughter and are reaching out to talk to people before the actual tests and surgeries are performed.
Our daughter is 8 months old and it is assumed that she has fluid behind her ears as her tympanic membrane hearing test was flatlined. The ENT was unable to 100% see her TM but wants to be agressive given our family background and her hearing test resullt.
So, after her post surgical & Pre-surgical exam she will receive tubes & be hooked up the hearing test that tests the signals going to her brain. The ENT and I didn't get too in-depth in the types of hearing aids that are available, but there was a fairly strong mention that it will be easy to fit her hearing aids because they should have her size on hand.
I read a message about the BAHA, so out of curiosity (The implant was also mentioned by the ENT) went to Wiki and read a little about it. I discovered that there is a headband that can be placed on infants because they don't like to do the actual implants until 4-5 years of age.
So… Long story closing - does anyone have experience with infant tubes, hearing aids, and/or headbands to attach the external device to infants heads?