If you're currently pregnant, on maternity leave, and/or due to give birth to your child during the tenancy, please ensure that you have made the property manager aware of this before you complete your offer. Once your offer has been accepted, you only need to submit details and documents for yourself for the time being, along with anyone else on the application.
If your child has been added to your application as a permitted occupier already, please ask the property manager to archive the permitted occupier (Under-18) from your application via the Residently app. Go to Support > Create new message > Request changes to your tenancy. Once the property manager has done this, you should be able to submit your application.
Once you've moved in and after your child has been born, you should inform the property manager and ask them to add your child as a mid-term permitted occupier to the tenancy.