I had one who SCREAMED for 7 months, one for 4 months, but the 4 month screamer had a milk allergy so once his parents believed they should try lactose free products he got happy, jeeeesh! The 7 month screamer is still here too and eventually I got her under control. Those are the two worst scenarios I've had. If they could all come in happy this job would be too easy, now wouldn't it?

If the parents are making suggestions and listening to your suggestions and making sure the baby's schedule is the same at home and daycare so she can adjust into routines then I say keep trying. If the Mom isn't trying to help you at all, well, good luck! You will know when you have reached your limit.