A.C.
For a soft polenta or grits, the proportion is 4:1 water:dry polenta--it depends a bit on whether or not they are stone ground (require more water and longer cooking) or a quick cooking type. Bring the water to a full boil, add a bit of salt and butter or olive oil. Whisk the ground corn meal into the boiling water, reduce the heat, and cover. Cook on low, stirring occasionally, should be ready in about 10 minutes. You can add breastmilk or formula to bring it to a soft enough consistency and cool it off.
Corn is a known allergen, so if you're a mom that worries about those things, you might want to hold off for a few more months.