During Open Enrollment, you and your spouse will apply as a household of two. When the baby is born, you can update your family information with the Marketplace to reflect that you have become a household of three. At that point, you will qualify for a larger premium tax credit, assuming your income stays the same. Subsidies for a family of 3 are larger than for a family of 2 with the same income. When you report your new family status to the Marketplace you will also have a 60-day special enrollment opportunity to add the baby to your plan and increase your advanced premium tax credit amount. You will also have the option of enrolling your baby in a different plan. However, you and your spouse generally will not be able to change health plans as a result of the “newborn” special enrollment period.