Brendan Fevola's 2-month-old daughter Tobi hospitalised for unknown illness

Just two short months ago Brendan Favola and his wife, Alex, brought home their newborn daughter home from hospital, but now they've sadly found themselves back there again.

The couple revealed on Instagram yesterday that their fourth daughter's health had taken a bad turn, so they took her to get medical treatment in Melbourne's Monash Children's Hospital. In the heartbreaking photo, tiny Tobi could be seen in a hospital cot with a drip in her arm.

"Didn't think it was possible to love you any more beautiful girl but seeing your innocent little face still trying to smile at me through your tears, was heart wrenching," Alex captioned the pic. "I can not thank the Nurses and Doctors enough, for helping my little cherub get better. Still not fully well but feeling a lot better thanks to the wonderful care. Can't wait to get you home bubba."

In her caption, makeup artist Alex -- who shares three other daughters with Brendan, Mia, 18, Leni, 12, and 8-year-old Lulu -- did not reveal the exact cause of Tobi's illness, but in another post Brendan hinted that the tiny tot was slowly on the mend.

"Tobi is on the road to recovery this little champion has been the best baby over the last 2 days," he shared. "@alexfevolamakeup your the best mum a baby could ask for, you are exhausted and haven't slept and still haven't stopped looking after our baby. Both having a nap now Alex first in 36 hours I love you snooks.

It seems Brendan hasn't had much sleep himself, with the doting dad posting Instagram Stories from Tobi's bedside.

The Fifi, Fev & Byron radio personality has even made himself right at home at the hospital's resident radio station, Radio Lollipop, as he helps to spread cheer to other sick children.

"Sorry @fifibox @byroncooke I've found a new gig," he told Fox FM co-hosts Fifi Box and Byron Cooke as he made his way inside a recording booth.