Girls, who have boys, today I noticed that during urination the foresk…

Girls, who have boys, today I noticed that during urination the foreskin swells up like a balloon and the stream is intermittent. We're going to see a pediatrician on Thursday, we'll see what he says. The baby is 4 months old, anyone who has dealt with this, what did they say, what did they do? I understand they cut it in case it swells up.