I am pregnant of 37 week 4 day's as on 12-Dec-2017. My earlier ultrasound reports are showing my due date as 27th of December 2017. But in the last ultrasound report my due date is postpone to 6th of January 2018. And also my estimated Fetal weight showing 2.6 kg where as I am expecting more than 3 kg. Before pregnancy my weight was 50 kg and now 55.5 kg. Is it normal or I have to do something extra to put on some more weight for good health for my coming baby.