It’s only fair to be straightforward instead of dropping bombs later because some people may not be okay with dating people with children.
When dating a guy with kids, find out what kind of package deal he comes with.
If he has a child, what type of dealings does he have with the child’s mother? How would that potentially affect you in terms of dating?
If avoiding drama with the mother doesn’t seem doable, then run for the hills and never look back.
For example, unless things are getting serious between the two of you, you shouldn’t feel obligated to spend time with his child.