The child should not be given that prescription because 250 mg/125 mg amoxicillin and clavulanate potassium tablets should not be used until the child weighs at least 40 kg or 88.1849 pounds, because of the different amoxicillin to clavulanic acid ratios in the 250 mg/125 mg amoxicillin and clavulanate potassium tablets (250/125).