Solely Formula milk Dulac

At 29 days old, pooping once a day on formula is actually quite normal, especially with Dulac which tends to be gentler on little tummies. That said, since he's still so young, it might be good to bring him to the PD just to make sure everything else looks fine like his weight gain and feeding, especially since every baby is a bit different with how often they go. As long as his poop looks normal (yellow, not hard or watery) and he seems comfortable and is feeding well, you're probably fine, but the PD can give you proper peace of mind.

quite normal for formula-fed babies to poop once a day