My step son is 5 years old and I'm pregnant with my first,his only sibling so far. He's already asking about helping to feed his brother and we always agree he can help. However since I plan to breastfeed only for the first few weeks and pump after a month I'll have to explain that baby gets milk from my breast. We try to keep him as innocent as possible even though I'm sure he hears vulgar things from other people but I need to know how to tactfully explain that and also any possible questions that might come up and how to answer. Any mom's have advice?