Giving birth is not an achievement,
The minimum lease period is 3 full weeks for a fixed base price. I recommend starting the lease period from week 37.
Haven’t given birth by then? The extension goes automatically up to a maximum of 3 weeks after your due date. All the time you need!
Each lease period has a fixed deposit which will be refunded to your bank account (minus any extension fees) after you return it complete and clean.