'Perfect in every way': Parents pay moving tribute to 17-month-old son as murder probe continues

The parents of 17-month-old Ronan Davies have paid tribute to their little boy, as the investigation into the toddler's suspected murder continues.

The Adelaide mother and father have described the toddler as "playful and perfect in every way".

They say they're lost without their happy and cheeky little boy and often still look for him, in denial that he's gone.

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His heartbroken father posted a video to social media, saying the pain will never go away.

Ronan's aunt, meanwhile, told 9News the youngster was "the happiest and most soulful little baby with a smile that would capture your heart".

She said he was "loved by the whole family."

His parents were questioned by detectives again today.

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Police believe Ronan suffered critical injuries while at the home of babysitters, who were friends of his parents, earlier this month.

When he was returned to his father's home in the Adelaide suburb of Ottoway, he appeared to be asleep but never woke up.

He was rushed to hospital but couldn't be saved.

Ronan had suffered head and other serious internal injuries and died two days later.

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Police are seeking information from anyone who might have seen Ronan being pushed in a pram with his favourite toy attached near the babysitters' home in Ferguson Street, Glenelg North, on the afternoon of Wednesday, June 7.

Since making the case public, SA Police say they have received multiple tip-offs.

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