Can Wigobi or Maunja be effective for weight gained rapidly after pregnancy?

A close friend gained 20 kilograms after getting pregnant, and now
I'm worried about dieting ahead of giving birth.
 
The weight gained rapidly after pregnancy is also Wigobi or Maunjaro
Is it okay to omit it? Even while breastfeeding
I'm wondering if it doesn't matter if I use Maunza or Wigobi.