In the present study, the effect was investigated of administering an oral electrolyte solution (Glutellac(R)) to newborn Belgian blue calves on their vitality, the acid-balance in the blood, and their passive immunity. Twenty newborn calves were incorporated in the study, of which ten were administered a placebo and ten were administered Glutellac(R). Only three calves showed metabolic acidosis. The group, which was administered Glutellac(R), showed a significant higher base excess at two hours (p < 0.05), six hours (p < 0.001) and twelve hours (p < 0.001) after birth. Clinically and in terms of IgG absorption capacity, there were no significant differences between both groups. In conclusion, it can be stated that the administration of Glutellac(R) to Belgian blue calves without metabolic acidosis immediately following birth by caesarean section beneficially influences the base excess.