I would suggest you go ahead and try warm, or even cold.  My LO didn't have any diaper washing issues until he got a bit older.  You'll know if you need to change to a warmer water temp--the baby will get a rash because the det. isn't rinsing well, or they will smell funny.  Don't worry about new-baby stains though, because they come out w/ sunning or repeated washing, and aren't a sign that you need to change your routine.

Welcome, and congrats .

DO you have hard water?  We do, so we need the hot wash to get the detergent to suds, and then rinse out.   

I think you will be fine with warm water. I always wash on warm, rinse once in warm and final rinse in cold. Sometimes I add another warm rinse before the final cold rinse if I have an extra large load or if I put too much detergent. The dipes come out fine. I only time I used hot was to prep and when I had to strip the BGs because of DD got rashes I suspect from detergent residues. We used All F&C we get from the base commissary, now we are using Purex baby, hopefully it will be fine. I do put baking soda in the pre-wash for the fitted and inserts which I wash separate from the dipes with PUL. I also put Calgon with the detergent in the wash.