Hello, welcome to HCM, I am Dr. Das
Look, it is impossible to increase the weight of baby upto 4 kgs within this period.
But, you have to try your best for increasing the weight of your baby.
First of all, you have to take rest adequately.
You have to take high amount of protein. You can also take the protein supplements
These two options will help you to increase the weight of baby. And you have to do ultrasound
scan every two weeks to track the increase of fetal weight.
Hope this becomes helpful.