M.D.
Hi J., welcome to Mamapedia, we're glad you're here!
You ask a common question. First, I should clarify there is no way to respond directly and publicly to someone else's responses to your question -as in Facebook. However, you can always respond privately to any member by clicking on their profile name, (seen at the top of their comment) which will take you to their profile page where you will see a clickable large SEND PRIVATE MESSAGE button. Simply click on it to send a private response to their comment. Second, you can also always follow up after receiving comments, more generally, with additional information or thoughts by using the SWH (so what happened) button provided for each question you post.
Thanks J.!
M.
Community Manager