Weight loss

Hi all, trying to figure out when I’ll fit into my jeans again. I’m 5’3” and was appx 115 lbs pre pregnancy. Got up to 144 at full term. Baby is now 1 month old. I lost the first 15-20 lbs in the first two weeks. But now the last 10 pounds just won’t go away. Have been eating healthy, walking 3 miles/ day, and breastfeeding. Starting to get discouraged.