Hello Doctor, Previously When My Baby Had Cold She Was

Hello Doctor, previously when my baby had cold she was advised Alex + paediatric drops 0.3ml twice a day. She was 6.61kg then. She is suffering from terrible cold and cough since yesterday. Her weight now is 7.05kg. We gave her 0.4ml of Alex+ drops twice yesterday but it doesn't seem to work good. Kindly advice if we should increase the dosage or this will suffice her body weight.