Sometimes the parents just won't hear it. You have told them and now I'd leave it alone. Part of the problem is that we are just "babysitters". My only other suggestion is the next time they have a doctors appt for the child suggest that they mention it. Sometimes parents just can't see problems in their own child. I have been through this twice, and both times after being ignored the child was eventually diagnosed with autism. Being a dcp can be so hard sometimes