text: this depends on how old you are because if you are between 15 and 30 years old 45 kgs is too light and may be at risk of becoming anorexic if you are trying to put on weight i suggest you see a doctor 65 kgs is a more healthy weight and a doctor will be able to help you do it healthily 20 kgs is a lot to put on in two months cant understand 'pounds' that's too hard to work out i think 5 pounds equals 2 kgs good luck see a doctor