Nimra if you talk with your doctor, they can organize a care plan where You get to see a dietitian for very little $$. I think it's called an Allied Health Plan. The dietitian could help teach you about eating enough of all the different food groups so your body is well nourished and healthy.
And tell those mean people who make nasty comments that having some weight on after having a baby is essential for Breastfeeding and hormone balance. It ensures you and your baby survive. Or take the other route and tell them to keep their opinions to themselves!