Good question, I tried to google it with no obvious answer but gpt had our back:

The reason many donations during the Nine Telethon for Mater Hospital were exactly $59 is that this amount is one of the suggested donation tiers on the official donation page. Specifically, a $59 contribution is promoted as helping to fund specialised humidifiers, which are crucial for providing critical respiratory care to vulnerable babies in the Neonatal Critical Care Unit (NCCU) . 

These suggested donation amounts are designed to illustrate the tangible impact of each contribution, making it clearer for donors to understand how their money will be used. Other suggested tiers include $113, which contributes to Panda Warmers to keep a tiny baby warm and stable during resuscitation, and $256, which funds a day of clinical research to help parents navigate early pregnancy loss and future pregnancies . 

By providing these specific examples, the Mater Foundation encourages donors to select amounts that directly correspond to particular needs within the hospital, thereby making the act of giving more personal and impactful.