Telling your young kids where babies come from can be a hard thing to do.
You'll ask yourself, are they old enough to know? How much do they know already? What do you think happens?
If you're a traditional parent, you might decide to tell them about how the stork drops off babies to hopeful mothers, and then hope they buy it and avoid the subject all together.
If that's not your style, check out How to DAD's video on how he would handle the situation, you might want to use one of his tips.