Science & Innovation
In the first few months of their lives, infants experience new sights, sounds, scents, and textures. During this time, they also make contact with new organisms. It takes up to three months for portions of infants’ still-developing immune systems to mature.1 During these early weeks and months, infants are too young to receive their first vaccines, leaving them vulnerable to developing serious infections.2Most pregnant people transmit antibodies to their developing fetuses naturally starting in...