DS is 5 months (and a very tiny 5 months, only 14lbs) up until now he's been in a crib but last night was the first night he has been in his cot. Disaster 
He woke me up every hour and a half by turning in his sleep and whacking his head on the bars, can I stop him doing this?
On top of this, he can't sleep with out holding onto a blanket or a muslin but has started to pull them up over his face, panics and starts crying so combined with the head bashing, I'm never going to sleep again
I'm basically repositioning him after the head whack, giving him a dummy and muslin to go back off to sleep, staying awake until he falls asleep, removing the muslin from his teeny hands, going back to bed and then waiting 90 mins for the cycle to start again.
He has a cot bumper at the top of the cot, could I remove said bumper and tie it down the side that he turns (it's always the same way) to pad the side out a bit. If I tie it on super tight, he won't get it off, I was yanking it before I put him in the cot and it wasn't budging, I know he won't be able to move it.
Anyone have any ideas?
sorry if this is slightly rambly, I'm v tired!