I have had a dck for about 10 months now, VERY hard transition for him, he was swaddled before coming so really resisted napping if he was not swaddled, screams, naps for 15-20 min. then wakes up just wailing...well the past few days I guess at home he has started banging his head VERY hard on the floor, against the wall etc. but he hasn't done it here.....until today. He went down like a dream for a nap and about 20 minutes later I heard this huge noise so I went to his room and he was smashing his head against the wall, I laid him back down and rubbed his back, head etc and he was sooo tired, I backed out of the room and it lasted about 10 seconds and he was up doing it again....I moved the crib away from the wall and he started banging his head on the crib. I have never had a child do this and at 20 months I think he is to old for behaviour like this. I messaged the mom and dad immediately and told him this will not be tolerated and that I do not want him to hurt himself. Any other suggestions to get this child through this "stage" He's also been a biter for a long time. The mom is always saying, "oh he's just frustrated and trying to assert himself" I finally said, no he's having a temper tantrum and he has to stop, lol. How do you get through to parents like this. I'm at my wits end with this little one and I have tons of patience, thank goodness