adobe illustrator - Rounded corner shape with rounded sides

I'm struggling to make the below shape in illustrator:

Rounded corner rectangles are easy but I'm not sure how to round the sides easily as well. I would want these shapes to be easy to re-size ideally. Can anyone nudge me in the right direction?

Answer

Effect > Stylize > Round Corners (or use the Rounded Rectangle Tool)

Then apply Effect > Warp > Inflate.

Or....

• Draw a square


• Draw a circle larger than the square


• Rotate the Circle 45°


• Select square and circle and choose Object > Blend > Make



• Now choose Object > Blend > Blend Options set the drop down to Specified Steps and add steps until you see the shape you want and then click OK.


• Object > Expand Appearance


• Object > Ungroup


• Delete the shapes you don't need.