Before the baby arrives: Step 1: Register for a BirthMail account online. Step 2: Log in and enter your call list of up to 50 phone numbers. The day your baby is born: Step 3: Call 877-723-3811 any time 24 hrs a day. Enter your assigned pin, record and send your message. Step 4: Your message is sent between the hours of 7 a.m. and 11:00 p.m. EST to all of the numbers on your call list.