How to give Lactogen 1. Is dehydrated?

My breast milk is not sufficient for my baby born on 3 rd June, now 22 days old. On 21st she got infection and is getting intravenous antibiotics dose. The report and the antibiotics dosage attached. She doesn't latches properly we are trying hard to make her latch. Sometime she feeds but not vigrously, we use to express the milk from breast and feed her but that is also not sufficient. Hence we have to resort to lactogen 1 because she has urinated after almost 6 hrs that also after giving lactogen. I want to know what should be the dosage of lactogen, I am giving 30 ml after every 2 hours and if she takes the expressed milk from breast I do not give him the lactogen for 2 hours. Her weight was 3.3 kg at birth but when she had fallen ill with high fever on 21st june her weight came down to 3.1 kg. Please suggest me: 1. How much dose of Lactogen 1 to give? 2. How to monitor the baby urination cycle, and when to worry that she is dehydrated?