As a dad of a toddler girl, I don't look forward to her having to navigate these incredibly difficult waters with her. Unfortunately, I will have to find ways to help her exist happily whatever her body type is. The link below will show you a young woman's interesting set of advice to put in the hopper. I am not convinced that avoiding the subject completely is the way to go but I like some of the concepts here.
"Encourage your daughter to run because it makes her feel less stressed. Encourage your daughter to climb mountains because there is nowhere better to explore your spirituality than the peak of the universe. Encourage your daughter to surf, or rock climb, or mountain bike because it scares her and that’s a good thing sometimes"