**Core Concept**
The child is now 11 months old, and the vaccination schedule needs to be updated according to the recommended immunization schedule. This involves administering vaccines that protect against common childhood illnesses, such as measles, mumps, rubella, diphtheria, tetanus, pertussis, and Haemophilus influenzae type b (Hib).

**Why the Correct Answer is Right**
At 11 months, the child is due for a booster dose of DPT (diphtheria, pertussis, and tetanus) vaccine, as well as the measles, mumps, and rubella (MMR) vaccine. The DPT booster dose is essential to maintain immunity against these diseases, which can be life-threatening if not prevented. The MMR vaccine is also crucial, as measles can lead to serious complications like pneumonia and encephalitis.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the child has already received the first dose of DPT vaccine at birth and may have received subsequent doses, but the specific schedule for booster doses may vary depending on the country or region. However, the MMR vaccine is not typically given at 11 months, as the first dose is usually administered at 9-12 months.
* **Option B:** This option is incorrect because the child is not due for a Hib vaccine at 11 months. Hib vaccines are typically administered in a series of doses, starting at 2 months, with a final dose given at 12-15 months.
* **Option C:** This option is incorrect because the child is not due for a pneumococcal conjugate vaccine (PCV) at 11 months. PCV vaccines are typically administered in a series of doses, starting at 2 months, with a final dose given at 12-15 months.
* **Option D:** This option is incorrect because the child is not due for a rotavirus vaccine at 11 months. Rotavirus vaccines are typically administered in a series of doses, starting at 2 months, with a final dose given at 8 months.

**Clinical Pearl / High-Yield Fact**
Remember to check the local immunization schedule and update the child's vaccination record accordingly. Additionally, always ensure that the child has received all the necessary doses of vaccines, including any catch-up doses, before administering the next scheduled dose.

**Correct Answer: B. DPT booster & MMR**