[Hypocalcemic tetany in 'alternative' soy milk nutrition in the first months of life].

A 14 weeks old infant was admitted to the intensive care unit with life-threatening hypocalcemic-hyperphosphatemic spasms. Hypocalcemia-hyperphosphatemia was found to have been caused by feeding a high phosphate/ low calcium soy milk. The daily uptake of calcium was calculated to have been 3.3-6 mmol that of phosphate 30 mmol. The parents strongly believed that soy milk formulas were equivalent to breast milk and cow's milk formulas and lived on a strictly vegetarian diet. Therapy with calcium (at an initial dose of 2.25 mmol/kg/day) and 1.25 OH vitamin D3 (Rocaltrol, 0.25 microgram/day) normalized Ca, PO4, vitamin D and parathyroid hormone levels rapidly. Vegetarian feeding had led to life-threatening hypocalcemic hyperphosphatemic spasms in the infant. We conclude that malnutrition and false nutritional beliefs have to be included as a potential cause of early hypocalcemia in infants.