Chop all the fruit in small pieces (if you are serving the bark to a baby, very small pieces to avoid any chocking hazard)

Mix the vanilla with the yogurt

Spread the fruit on a baking sheet lined with some parchment paper

Spread the yogurt on top, level and freeze for 2 hours min.

With a knife break the big frozen yogurt piece in small pieces, as small/big as you like

Serve immediately, it will melt in 10 minutes