Crib Problems

Hi there, Just wondering whether anyone who uses a crib has problems with LO waking up because they get their arms caught between the bars?
Jake will be moving to his big cot in the next weeks or so and has got so used to having his arms tucked in so tight that he will prob have troubles as it will be hard to tuck in so tight in a bigger cot. I cant let him have his arms out as he would wake every half hour now...
Thanks