For babies whose mothers are carriers of Hepatitis B surface antigen+ , it is recommended to undergo a Hepatitis B five-item test around seven months to one year after birth to determine if the baby has been infected with the Hepatitis B virus.
A baby’s fontanelle, typically measuring 1.5 to 2.0 centimeters at birth, expands as the head grows in the first few months. Generally, it starts to shrink around 6 months after birth and closes completely by about 18 months. The posterior fontanelle, a triangular space between the occipital and parietal bones at the back of the head, usually closes within 6 to 8 weeks after birth.