Hi, I understand your concern. You are breast feeding ,,mother of a 10 months baby. Actually on an average, 11-12 kgs of weight gain is normal during pregnancy. which comes back to normal i8n one year after delivery when mother breast feeds * I feel the extra weight gain you had was due to your thyroid problem. You are taking medicines, but I would suggest reassessment of thyroid function tests & consultation of an Endocrinologist for treatment.Sufficient thyroid replacement along with - breast feeding, - exercises ( walking/yoga/ suryanamaskaras-45 minutes), adequate sleep of 8 hours, -healthy eating with 1500 extra calories in form of proteins, vitamins, minerals, iron, calcium.life style would reduce your weight ( no sweets,starches,fast food, fried spicy things cakes,pastries etc), * I would also advise for fasting & post meal blood glucose to exclude diabetes- another cause for excess weight gain. Thanks. Thanks.