Postpartum weight loss HELP

Hi mommies...

I’m 4 weeks pp with my 3rd child.

I go back to work in 2 weeks and my work clothes are far from fitting me, with my first two kids I lost the weight after about 9 months of having them with breastfeeding/diet/exercise. I gained the most with this pregnancy though, and I’m wondering any tips you might have for losing the weight? Especially with multiple pregnancies.

TIA