Erin McNaught has shared a health update with her fans after her eight-month-old son Obi underwent surgery to remove a brain tumour.

The Australian model, 43, revealed on Monday that her son has been ‘achieving more and more’ each day as he recovers.

‘It’s 1 month today since Obi had surgery to remove a massive brain tumour that he was only diagnosed with a few days prior,’ she wrote on Instagram.

Erin then recalled how she felt on the day of her son’s surgery after she her and partner Stace Cadet woke up early and went to the hospital.

‘I stood on the balcony and watched the sunrise and sobbed so hard I couldn’t breathe. The thought that this sunrise might be the last one we saw with him still here on this earth was unbearable,’ she said.

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Erin McNaught has shared a health update with her fans after her eight-month-old son Obi underwent surgery to remove a brain tumour

‘When he made it through the surgery, we returned to the balcony and watched the sunset, and we cried again together.

‘Since then, Obi has blown us away with his recovery. Day by day, achieving more and more.’

Erin said she doesn’t ‘know what the future holds but is filled with joy, and happiness, and a deep sense of gratitude’.

‘We hold him close, and we hold our big boys, and we marvel at our little family, and how lucky we are. And we love each other the hardest.’

Erin revealed her son Obi had undergone surgery to remove a brain tumour last month.

She shared a photo to social media capturing her kissing her young son on the chest while he lay on a hospital bed, and she captioned it with some heart-warming words.

‘Today Obi had the surgery to remove the tumour. The amazing team here are very happy with the way it went,’ Erin began.

‘While it’s too early to tell much more, we are hoping this will have been his biggest hurdle.

The Australian model revealed on Monday that her son has been ‘achieving more and more’ each day as he recovers after removing the massive brain tumour

She went on to thank her followers for their support during this difficult time.

‘Taking each day as it comes but oh so thankful for today. Thank you everyone for all your beautiful messages of support.’

Earlier in the week, Erin and her partner, Stace Cadet, shared the devastating news about Obi being diagnosed with a brain tumour.

The couple, who welcomed their first child together in October last year, issued an emotional joint statement, expressing their anguish over Obi’s recent health battle.

‘For the last few weeks we have noticed a rapid decline in Obi’s behaviour and happiness,’ the statement began.

‘He was having problems eating, sleeping and most recently, keeping his head straight.’

They explained that after noticing the worrying changes they took Obi in for an MRI scan under the advice of their doctor.

The scan, conducted earlier in the week, revealed the shocking diagnosis – a large tumour located on the right side of his brain.

Erin said she doesn’t ‘know what the future holds but is filled with joy, and happiness, and a deep sense of gratitude’

‘At about 6:00pm Tuesday night we met with a neurosurgeon who broke the heartbreaking news,’ they said.

‘We are absolutely shattered and the last few days have been our hardest days.’

The harrowing update follows what was initially a joyful start to parenthood for Erin and Stace, who confirmed the birth of their son exclusively to Daily Mail Australia back in December following his birth in October.

The couple shared at the time that they had named him Obi and were over the moon to bring him home.

‘We are so in love with him, we can’t believe he’s finally here,’ Stace said in December.

The former MTV host also previously opened up about her difficult pregnancy, revealing the journey had been ‘a little touch and go at times,’ with health complications in the final trimester.