Back to original weight?

Mummy’s weight has been going up but not consistently. The last pregnancy, after delivery, Mummy’s weight loss took many months but then within one year, Mummy managed to fit into most of Mummy’s clothes. Mummy could not expect to loss weight within short period when Mummy’s body took about nine to ten months to expand. Any exercise? Mummy did not exercise much and no food diet because Mummy was breast pumping for one year. Most probably due to breast pumping and also busy with housework which partially help Mummy in weight loss.