Most humans do not tolerate the milk of another species, for instance, cow milk like in your situation. Your son is probably eating food now so doesn't need the other stuff. Your son is a human, not a calf, so he doesn't need (for any reason) the lactational secretions from another mammal. Someone suggestion almond milk, that's good if you want something for cereals. If you're concerned about calcium (as the dairy council likes to scare you) give him green veggies, sesame seeds and figs.
Have you tried cloth diapers? They can be more soothing to a child and don't have all the chemicals used in disposables which are used to keep the child dry. They are unhealthy and toxic and can be linked to genital cancers later in life.
the other thing about all those creams is they have petrochemicals in them, they don't properly absorb into the body and can block the skin from breathing and being able to heal on their own too.
You're a good mama from paying attention to your child and his needs!