Please answer this clearly

Suppose a disease is inherited via a sexlinked mode of inheritance, so that a male offspring has a 50% chance of inheriting the disease, but a female offspring has no chance of inheriting the disease. Further suppose that 51.3% of births are male. What is the probability that a randomly chosen child will have the disease? Let D = having the disease, M = offspring is a male, F = offspring is a female, 13 = not having the disease. Hint: Drawing a tree diagram might be useful here