The first deduction holiday for 2017 is already here. Because deductions for health & welfare occur 4 times per month, months with 5 pay periods produce a "deduction holiday". December 2016 had 5 Saturdays, so the first deduction holiday of 2017 will be Jan 10th. Because of open enrollment changes a higher number than usual are in "catch-up" status. See link below to FAQ - health & welfare deductions - for more details.
Yes, your newborn child will be covered by the Plan from the date of birth, as long as you enroll the child within 30 days from the date of birth. If you enroll the child between 31 and 90 days after the date of birth, coverage for the newborn child begins on the first of the following month. If you miss this 90-day period, you will not be able to enroll your newborn child until the next Open Enrollment Period. You will need to provide the Plan with the necessary documentation. For more information, visit the "If You Have a Baby" section on the Life Events page.