31 March 2015 Last updated at 18:32 BST
It's presented by Millie from Millie Inbetween, who asks why our appearance is such a big deal to so many of us.
The programme follows four children as they take part in an exercise to find out how they see themselves and popstar Meghan Trainor explains how she struggled with body image worries.
Watch more of Newsround's special programmes.
Newsround has made a special programme, called Being Me, exploring what kids think about their body image.