...before your baby was potty-trained, did you ever use baby supplies just for boys?
Only thing that pops to my mind right now are those pee covers - I'd have imagined you just shield yourself with diaper to avoid getting sprinkled on, but maybe pee covers are useful??
Anything else? Certain baby clothes easier than others (side vs front buttons)
Re: Those with boys...
It's fairly simple to avoid getting peed on when changing diapers. One tip I got that helped us a lot in the beginning was to unfasten the diaper, open it a tiny bit to let the air hit his parts, then quickly lay the front of the diaper back down because often times the feeling of the air causes them to pee. You just leave it on there a sec to let him do his business if necessary, and then uncover again and go about changing the diaper.
In terms of clothing, all the standard stuff we got at Carter's and places like that seemed to work just fine, i.e., regular onesies with bottom snaps, sleep 'n' plays, etc.
Beautiful rainbow DS born Jan. 2015
BFP #3: March 2016! EDD 11/17/16
Those pee shield and such are a huge waste of money. They don't stay on. Skip it. It easier and more effective to throw a baby wipe over them when you need to
2010: Infertility
October 2015: missed miscarriage #2 at 11 weeks (trisomy 22)