Final answer:
The onset period for neonatal conjunctivitis is within 1-7 days of life, making option 2 the correct answer.
Step-by-step explanation:
The onset period for neonatal conjunctivitis differs based on the type of infection. Gonococcal ophthalmia neonatorum caused by Neisseria gonorrhoeae and inclusion (chlamydial) conjunctivitis caused by Chlamydia trachomatis can appear within different time frames after birth. The onset period for neonatal conjunctivitis varies depending on the specific cause. For neonatal conjunctivitis caused by Neisseria gonorrhoeae, the onset period is within 2-16 days of life. However, if caused by Chlamydia trachomatis, the onset is typically within 1-7 days of life. Other bacterial infections acquired during childbirth can also cause neonatal conjunctivitis. The early onset disease, including gonococcal and chlamydial conjunctivitis, typically occurs within the first 7 days of life (within 1-7 days of life). Therefore, the correct answer to the question is option 2) Within 1-7 days of life.