Twice a week, Ben Bradshaw drops his young son off at a Sydney childcare centre before heading off to work.

Like thousands of parents and carers across Australia, the 40-year-old had always been confident that the staff have his child's best interests at heart.

But in recent months, that trust in the childcare system has been "eroded", the father-of-two says, after several high-profile cases of alleged sexual and physical abuse at centres across Australia.

"It's that old adage of cockroaches - if you see one in your house, there's 10 that you don't see. These are the ones that get caught. It's more scary the ones that you can't see," he tells the BBC.

In the past few weeks, 2,000 children in Victoria have been urged to undergo infectious disease testing after a childcare worker was charged with the mass sexual abuse of babies; police have named a Sydney man who worked for 60 after-school-care providers and is accused of taking "explicit" images of children under his supervision; a Queensland woman has faced court over allegations she tortured a one-year-old boy; and another two workers in Sydney have been charged after a toddler was left covered in bruises.