New births are registered on the Personal Demographics Service (PDS). The PDS is part of the NHS Spine.  This ensures that babies are issued with an NHS Number that is immediately available to organisations involved in the ongoing provision and recording of their care.

Midwifery staff will use one of two methods to register a birth:

• If they are using a PDS-compliant system, they will register the birth directly onto the PDS. This replaces the NHS Number for Babies (NN4B) service, which was decommissioned in early 2015.
• If they are using a non-PDS compliant system, they will use the Birth Notification Application (BNA) to register the birth onto the PDS. The BNA replaces the former Interim NHS Numbering Service (INNS). This was decommissioned in early 2015.

Once the baby's birth has been registered, the PDS notifies the following services about the birth: child health services, the NHS newborn hearing screening service and the Office for National Statistics (ONS).

The birth notification service:

• fulfils legal requirements to notify a birth within 36 hours
• ensures babies receive an NHS Number to support immediate and ongoing care
• prevents errors and duplicate registrations
• supports screening for new-borns and infants
• enables information to be shared between health and care organisations and
• enables births to be recorded accurately for population statistics.

In the past a service called NHS Numbers for Babies (NN4B) was used to allocate NHS Numbers. NN4B has been replaced with equivalent facilities that sit within the Personal Demographics Service, and on the Spine.

Users of the legacy NN4B system were migrated to the replacement services and NN4B was decommissioned.