How do I lose weight and breastfeed?

I really want to lose weight without giving up breastfeeding and going back to old habits.

I’m 2 months pp, I wear a xl and size 14 in pants...

before I was pregnant, I wore a small and size 2 in pants.

Several years ago, I wore a 3x and 22 in pants.

I’m vegetarian, and I eat A LOT of sugar so I know I need to cut sugars out.

I’m so frustrated with my body.