Corey Winmar, a Noongar man, says his grandmother warned him to stay alert when his partner's maternity care was transferred to King Edward Memorial Hospital in Boorloo / Perth.

"My grandmother knew straight away," Mr Winmar said.

"She said you want to be careful, because they're known for taking kids and sending them to foster homes.'"

Darlene Lou, Mr Winmar's partner, planned to give birth at Armadale Hospital, where she'd delivered her previous children.

But after disclosing past drug use to a doctor, the couple say she was referred to King Edward Memorial.

Ms Lou says she used methamphetamine in her younger years and a few times before her pregnancy, but stopped as soon as she found out she was expecting.

During a May appointment at King Edward Memorial, the couple say a woman introduced herself as a social worker and questioned Ms Lou about drug use, housing, and family support.

"She constantly kept asking my partner, 'Have you got any support?'" Mr Winmar said.

"I said, 'She's got support. She's got me. I'm a father, I've got my own house, I've got my own car, and I've got my boys.'"

Later, Mr Winmar says his grandmother warned the worker could be linked to the Department of Communities' child protection division.

"My grandmother said, 'She's not a social worker. She's DCP, and you need to be careful. What she's trying to do is open a case for your child,'" he said.

When they returned in June, Mr Winmar says he directly asked the worker about her role.

"I said, 'So you work with DCP? You are a DCP worker?'" he said.

"She said, 'No, I'm not DCP. I'm not with DCP. I'm a social worker.'"

Mr Winmar alleges the worker later admitted hospital social workers collaborate with the department.

"She closed her book and said, 'Your grandmother and your mother were right — we do work with DCP,'" he said.

Their son was born at King Edward Memorial on July 25.

Two days later, Mr Winmar says another worker visited and again asked about their housing and support network.

The baby stayed with his parents and left hospital with them.

National Indigenous Times contacted the Department of Communities for comment and was informed they had not opened a case involving Ms Lou, Mr Winmar or their newborn.

This publication also contacted King Edward Memorial for comment regarding the reported incidents, with a spokesperson saying: "Due to patient confidentiality, the hospital does not comment about individuals' circumstances of care received."

"The safety and wellbeing of newborns and their mums is King Edward Memorial Hospital's highest priority, and the hospital has processes in place to ensure appropriate support is available for patients and their babies post-discharge," they said.

Mr Winmar said no worker directly said the department planned to remove his son.

"No one said they were going to take my baby, but I think they were leading up to opening a case to do so," he said.

Ms Lou says the experience left her feeling frightened and judged.

"It made me worried that they were going to take the baby, the way they were speaking," she said.

"I definitely felt judged."

Mr Winmar says he feels compelled to speak out for young Aboriginal mothers who fear losing their children.

He says that commitment strengthened as he left King Edward Memorial with his newborn and saw his niece, who feared she would not be able to leave with her own baby.

"I left that hospital with my son, and my niece came running out and cried to me and said, 'Uncle, my baby's getting taken from me,'" Mr Winmar said.

"That's the hardest thing I've ever experienced in my life."

Mr Winmar says he promised his niece he would speak publicly about their family's experience.

"I promised my niece that, whatever it takes, I'm going to show this hospital what they've done," he said.

National Indigenous Times has not yet been able to verify Mr Winmar's niece's account.

Human rights lawyer and proud Bibbulmun Noongar woman Dr Hannah McGlade said the incident could be rooted in racism.

"From what I understand in the circumstances of this case, they had no call to interview Corey and his partner. There was nothing to give rise to any child safety concerns," Dr McGlade told National Indigenous Times.

"It does raise the issue of racial profiling, and it's these kinds of practices that contribute to the continuing rise in Aboriginal children being removed, notwithstanding Closing the Gap."