A 3-day old newborn is switched from a cow's milk formula to a soy-based formula due to spitting up. What key information should the nurse provide to the mother?

The key information to provide to the mother is that Similac Soy Isomil Formula is a soy-based formula that contains sucrose. This choice is significant because it highlights that the formula being used is specifically designed for infants who require a soy-based nutrition alternative. Infants who are switched to soy formulas may have issues with cow's milk protein, and understanding that the new formula is soy-based helps the mother grasp the nutritional adjustments being made for her baby.

Moreover, mentioning that it contains sucrose provides insights into the nutrient composition of the formula. Sucrose can be a palatable carbohydrate source for infants and can help with energy needs.

While the other options provide varying degrees of information about formulas, they do not directly relate to the specifics of the soy formula being introduced. For instance, stating that the new formula is a casein protein source would be inaccurate since soy formulas are based on soy protein, not casein, while the other options either reference unrelated formulas or specific conditions that may not be applicable in this situation. Understanding this can reassure the mother that she is following the appropriate dietary guidelines for her newborn.