What dietary alterations should a pregnant client with congenital heart disease expect?

In a pregnant client with congenital heart disease, caffeine should be restricted as it can increase heart rate, which is already under stress due to pregnancy. Sodium restrictions may be necessary to prevent fluid retention, which can worsen the client's heart condition. Decreasing calories, fat, protein, or fluid may not be appropriate as these can lead to nutrient deficiencies or inadequate energy intake, which is crucial during pregnancy. Therefore, options A, C, and D are not the expected dietary alterations in the client's diet during pregnancy with congenital heart disease.