Dannii Minogue says she struggles to carry her son because he has grown so big.

The petite star is mum to Ethan, two, from her relationship with former partner Kris Smith and told Glamour magazine how she is surprised by how quickly he has grown.

Dannii said: “He is sooo big. He’s as big as a three-year-old.

“It’s funny, because he’s still just a little baby and he needs Mummy to pick him up, but it’s getting harder. He’s heavy, but he’s just a complete and utter bundle of joy. Ethan has been my rock.”

The 40-year-old – who split from Kris in April, also revealed how a thyroid condition and appendicitis left her feeling exhausted when Ethan was a few months’ old.

She confessed: “It was a scary time because I didn’t know what was wrong with me. I remember looking at Ethan in the cot and thinking, ‘I don’t know how I’m going to pick him up’ – I had that little energy.”

“To have the thyroid condition and then the appendicitis, it was a lot for my body to take because only 10 months’ earlier I’d had a C-section to have Ethan.

“Now, for the first time in ages, I really feel like I’m back in my body. I have to take tablets every day for my thyroid and I have regular blood tests to monitor it, but I finally feel good again.”