We're expecting our second child soon. How can we best respond to our five-year-old's questions about how the baby got there, inside me!? Guest Expert, Lisa Kainan, MA, answers: When parents explain sex and birth to their children, they should take into account the child's level of understanding and allow the child's own curiosity to be a guide as to how much detail to give. The most accessible explanation will be one that is just one level above the child's current level of understanding. This level can easily be determined by directly asking the child some simple questions about where babies come from. Children can easily sense a parent's embarrassment or anxiety concerning this subject.