Protection begins early
Newborns are especially vulnerable to infections. Vaccines help build protection before exposure and reduce the risk of serious illness.
Hepatitis B at birth
Hepatitis B can cause lifelong liver infection. The American Academy of Pediatrics’ 2026 guidance continues to recommend a birth dose, generally within 24 hours for medically stable babies weighing at least 2,000 grams. Smaller babies may need a different schedule. AAP: 2026 recommendations
If the birth parent has hepatitis B, the baby needs vaccine and hepatitis B immune globulin—ready-made protective antibodies—within 12 hours. An unknown maternal result also requires an urgent prevention plan. CDC: Infant hepatitis B guidance
RSV protection and later vaccines
Some babies receive a long-acting antibody to protect against severe RSV, a respiratory infection. This is an immunization but not a vaccine. Eligibility depends on age, season, and whether protection came from vaccination during pregnancy. South Florida timing may differ from other regions. CDC: Infant RSV protection
Many routine infant vaccines begin around two months. Vitamin K given at birth prevents dangerous bleeding; it is not a vaccine.
Benefits and possible side effects
Vaccines prevent illnesses that can cause hospitalization, lasting injury, or death. Soreness and temporary fussiness can occur. Severe allergic reactions are rare. Tell the pediatric team about previous reactions or known immune problems. AAP: Early childhood vaccines
Frequently asked questions
Do vaccines overwhelm a newborn’s immune system?
Recommended vaccines are studied for use at the ages they are given.
What symptoms need urgent care?
A temperature of 100.4°F (38°C) or higher in a baby younger than three months needs prompt medical assessment, even after vaccination. Call 911 for breathing trouble, collapse, or severe swelling.
Questions about your pregnancy? Contact Davie ObGyn in Davie, Florida, at 954-880-1010. New and established patients are welcome. This information supports your prenatal care and does not replace an individual medical assessment. For urgent symptoms, call your care team promptly; for an emergency, call 911. Do not use a routine online message for urgent symptoms.
Medically reviewed by Rahil Malik, MD, FACOG, board-certified obstetrician-gynecologist. Last reviewed: September 26, 2026. This page is general information and does not replace a visit with your doctor.