Hello swati
usually in the first trimester, a woman should gain about 1 to 2 kilos and 1 kilo in around 2 weeks for the rest of the pregnancy period. For some people, less than half a kilo of weight gain in a week is also enough. In case of twins, 15 to 18 kilos of gains is considered adequate, which means an average of close to one kilo per week after the usual weight gain in the first trimester.