Final answer:
Infants born to mothers who use heroin may exhibit signs such as temperature instability, bradycardia, and difficulty feeding. As they grow, symptoms may progress to seizures and stiffness.
Step-by-step explanation:
Infants born to mothers who use heroin during pregnancy may exhibit various signs and symptoms. These can include temperature instability, apnea (cessation of breathing), bradycardia (slow heart rate), hypotension (low blood pressure), difficulty feeding, irritability, and limpness. As the infant grows, symptoms may progress to include seizures, bulging fontanel (soft spot), stiff neck, hemiparesis (weakness on one side of the body), and opisthotonos (rigid body with arched back and head thrown backward).