Add 100ml of water to a medium saucepan. Bring to the boil. Add the cauliflower and reduce the heat. Cover and leave to steam for 5 minutes or until completely tender. Drain the cauliflower.
Add the cauliflower, avocado and butter beans to a blender, along with the milk. Blend until smooth.
Tip: You can use breast milk or formula in place of the whole milk.