We hadn’t thought of that either, and only submitted a new Affidavit of Support after the baby was born due to some updates to our financials. I would guess it’s better to be safe than sorry and resubmit, even if the baby is the only change for you. But I’m far from an expert on what is required/recommended. I bet the question has been asked before somewhere on this site, so it might also be worth searching the forums.