want to loose weight

im a mother breastfeeding, baby 7 months i tried to loose weight using a diet but didn't, i want to know why i don't loose weight, and what can i do to loose

After my first pregnancy I was having alot of trouble losing weight also, and found that cutting calories wasn't doing anything. My sister who is strictly vegan told me that when she cut out just meat she lost alot of weight. I was desperate and cut meat from my diet and found my protein in other foods such as nuts, beans, and dairy products. I lost all the belly weight and now am back to my normal eating habits without any weight gain.