Most doctors recommend an iron-fortified formula with a cow's milk base. If the baby is allergic to cow's milk, a doctor may recommend soy-based formula.
Some things that may indicate a need for a change of baby formula are dry, red skin, diarrhea, extreme fatigue or forceful vomiting, as these can indicate an allergy. Talk with your doctor before changing baby formula.
Baby formulas come in a powder form that requires you to mix one scoop of powder with two ounces of water, a concentrated liquid that is mixed with equal parts water, and a ready-to-use form that requires no mixing.