The correct answer is option 2, within 48 hours. BCG vaccination is given to newborn children to protect them against tuberculosis. It is important to administer the vaccine as early as possible to ensure maximum protection. Within 48 hours of birth is the recommended timeframe for giving the BCG vaccine. Option 1, immediately after birth, is not entirely accurate as it suggests administering the vaccine right at the moment of birth, which may not be practical or necessary. Option 3, within seven days, and option 4, within six months, are both incorrect as they exceed the recommended timeframe. It is essential to adhere to the specific guidelines provided by healthcare professionals for the accurate and timely administration of BCG vaccination to ensure the newborn`s well-being.