Most formula switches should wait until the morning when a nurse can review your child’s chart and offer more accurate advice. If you are extremely worried and feel you need to make some switch before morning, it would be reasonable to purchase one can of Enfamil Nutramigen or Similac Alimentum formula and give this until discussion with our office. These are hypoallergenic, very easily-digestible (and quite expensive!) formulas, which are effective for the vast majority of formula allergies or intolerances.
I think my baby might need to switch formulas.