D.P.
Hi L.,
My son also had the speech screening in pre-school and I, too, noted my concerns on the permission slip. He had a hard time saying "w's" (instead of 'luckily', he'd say 'wuckiwy', etc.) The eval stated that certain soounds are more difficult at that age. He's speaking just fine now, at 6, so we didn't do any additional speech therapy and he' fine. That said, if YOU feel it's pronounced enough to be concerned about, maybe you should ask your ped for a Rx for an eval. If you'd like to find a private therapist to come to your home, I can point you in the direction of a friend who works for EI but does a few private clients as well...
ADDED*** L.--I do specifically remember being told NOT to make them repeat the words/sounds they're having an issue with over and over....if they can't do it, they CAN'T do it!