Final answer:
Acneiform lesions on the nose and cheeks of a newborn baby are most likely milia, which are tiny, benign cysts present from birth, making C) Milia the correct answer.
Step-by-step explanation:
Acneiform lesions on the nose and cheeks of a day-old baby may correspond to a few conditions, but considering the age and location, the most common would be milia, which are tiny cysts filled with keratin that appear as small white or yellow bumps on the skin. Unlike neonatal acne, which could be inflammatory and may not appear right at birth but rather over the first few weeks of life, milia are present from birth. Conditions like erythema toxicum also typically manifest with more widespread rash and miliaria is usually related to heat and sweating. Hence, the answer is C) Milia.