my self sruthi age 25,I am a breast feeding mother .my weight is 40kg ..being underweight as a mother how can I overcome this problem

A. First Try to get a thyroid test done for yourself if you are losing weight that way then you could be thyroid positive and the second thing is if it is not positive it is negative then you should consult a nutritionist or dietician they can help you with the correct plan which will help in increasing your weight