Mostly pregnant mothers always light weight not too heavyweight up to their dr's choice can walk treadmill,cardio and bike also mostly first time mom can get back gym after baby born around 4-6 weeks on recovery or months mostly mothers chosen have natural birth or c-sections who had history c-section on scars and shred baby weight..
Prince William's wife Kate,Duchess of Cambridge lose weight after baby boy George born on July 22 around one month she exercise include yoga,run,anythings and she eat careful to lose more weight she get slim perfect back as normal..
Princess Anne's daughter Zara ride horse when she expecting and she stop compete when she pregnant like mother and daughter did! But she got back complete after her daughter Mia born on January about 3-4 months later..