evidence: - (on their) Back—Babies should always sleep on their back to prevent Sudden Infant Death Syndrome. [...] - Close family and friends who spend time with your baby should ask their doctor for the Tdap immunization to protect your baby from pertussis (also known as whooping cough), the influenza vaccine during flu season, and the COVID-19 vaccine. [...] Always supervise your baby when in the bathtub or when near water.