Can I set up an LPFSA after a birth, death, or other qualifying life event?
Yes. You'll have 30 days from the birth of a child, a death of a family member, or another qualifying life event (QLE) on this list to set up a new LPFSA. When you do, the plan will have a retroactive start date of the first of the month in which the event occurred.
Keep in mind that if you're expecting a newborn, you need to wait until after the child is born to set up the account.