Stressed

Hey ladies I was wondering if anyone know what is the best formula for babies? I pick extra meal and a yellow can but then got switched over to the purple can which is gentle ease my baby been very whiny and plus he strains when he make a bowel movement. I don’t know what that is but he’s only a week old and I’m thinking about switching the milk again! I don’t know maybe I will try similar but I’m not sure yet. If you’re questioning why not breast-feed it’s because I have Cyst in my breast 🥲