The nurse is preparing an educational session on immunizations for a group of parents with infants. One of the key points is the recommended vaccination schedule for the first year of life, specifically focusing on the DTaP (Diphtheria, Tetanus, and Pertussis) vaccine. According to the CDC guidelines, the first dose of the DTaP vaccine should be given at age _____ months, the second dose at _____ months, the third dose at _____ months, and a final booster dose between ages _____ and _____ months. The nurse emphasizes the importance of adhering to this schedule to promote health and prevent disease among infants.