As you meet all the requirements detailed in each department description, you will be able to expand your premises to add new workplaces, hire more people, or unlock new upgrades.

 

Check the green arrow over the Delivery Room. That indicates that you can level it up! 

 

 

Do you remember how to fill the rank bar? So easy! Just select a work spot in a specific department, and upgrade all the elements! All these upgrades will help you to grow as well. Read their descriptions to choose the most suitable one ;)