The medical for the our children (toddler and baby) just involved a physical exam. The doctor felt their tummies and backs, looked in their ears and mouths and then measured their height and weight. No X-ray, urine or blood test but I believe children from some countries do require a blood test.
Yes it has to be a panel physician so the same place you have the adult medicals. They will be able to tell you the cost as that is dependent on where you have it done.
Unless a medical professional has told you not to vaccinate your baby I would urge you to do some serious research on the matter. It’s important that you are aware of the implications of your baby catching any of those life altering/ending diseases and whether you think it’s worth taking the risk. Added to that, the Australian government do not look kindly on those that choose not to vaccinate and withhold some benefits and restrict access to childcare and education during the event of an outbreak.
I am not judging you, trying to make the right choices for your child can be hard but in this case I hope you think long and hard about this as it could potentially impact your child for the rest of their lives.
Good luck with the visa process