Singer Carrie Underwood says her post-baby body is different, but she's embracing the changes.

The 32-year-old - who married hockey star Mike Fisher in 2010 - gave birth to Isaiah Michael Fisher in February.

"I weigh more than I did when I was at my smallest, but I have a lot more muscle tone. I feel like my bum's a little nice than it used to be," Underwood told People magazine.

The "Blown away" crooner's relationship with Mike has also changed since they welcomed Isaiah into the world, but they are keen to have more children, reports femalefirst.co.uk.

"Your marriage does change a lot when you have a baby. It's a whole new dynamic.

If we could keep having babies like Isaiah, we'd probably have quite a few. I would love to have a girl," she added.