Please do not stop or change your child?s medication abruptly, as stopping sodium valproate suddenly can trigger seizures. Weight gain and memory difficulties are known potential side effects of this medication. I highly recommend scheduling an appointment with his paediatrician or neurologist promptly. The doctor can safely evaluate these symptoms, check the medication levels in his blood, and discuss adjusting the dosage or gradually transitioning to an alternative treatment. For the weight gain, encouraging a balanced diet and gentle physical activity is helpful, but the priority is discussing these cognitive and physical changes with his healthcare provider to find the safest path forward.