My 4-5 week old ducklings nose keeps wheezing no matter what.

[nicolelynn]

I have two ducklings, mine is a lot larger than my brothers (we think his is a femal runt). His nose wheezes a lot, in their pin we have a small water dispenser and a bowl they can each get their whole head down in, but for some reason it only seems my duck will clear his nose when we put them in the bath for a little practice swim/play time. So I've been having to do this everyday because I'm scared he's going to suffocate. I've looked inside his nostrils with my flashlight and see nothing that could be blocking or causing the wheezing and I'm worried. Should I put a larger bowl in their pin for him or just keep up the everyday bath time?