Some formulas have very little iron or none at all. Most doctors recommend using an iron-fortified formula. Some formulas are made from soy milk instead of cow's milk. If your baby seems to be allergic to formula made from cow's milk, your doctor may suggest using a soy-milk formula.
CIP (Congenital Insensitivity to Pain) is a disorder where a person cannot feel pain. CIP can also lead to CIPA (Congenital Insensitivity to Pain with Anhidrosis) where the body cannot feel pain and it cannot perspire (sweat). CIPA almost rarely ever developes from CIP but there has been cases.
This kind of pain is called tactile allodynia. Here's what that means, in non-medical terms:  1 Allodynia means a that your body perceives something as pain when it's actually harmless. Pain is supposed to come from damage, but no damage is present or being inflicted.  Tactile means touch.