After the baby is born, the hospital will give you a Notification of Live Birth and Advisory Note from the Immigration and Checkpoints Authority (ICA). Within 2 weeks, use these documents to register for a birth certificate.
The advisory note is also a Special Pass that allows your newborn to stay in Singapore for 6 weeks. During this time, you should get a passport for the baby from your embassy or high commission.
in the upper-right corner of this advisory note, there's a DE no (Hxx-xxx-xxx-x).