Toddler bed for my 3 yr old?

My son just turned 3 a week ago. he has started to complain that he cant sleep in his bed that its not comfortable. He still sleeps in his crib. I have tried to make it more comfortable by laying a blanket or 2 on top of his mattress and then putting on the sheets. The crib was from another family member and so... show more My son just turned 3 a week ago. he has started to complain that he cant sleep in his bed that its not comfortable. He still sleeps in his crib. I have tried to make it more comfortable by laying a blanket or 2 on top of his mattress and then putting on the sheets. The crib was from another family member and so was the mattress. Should i get a new mattress for the crib? would it be ok to get him a toddler at the age of 3? Could something else be bothering his sleep at night to have him complain about the bed and then to toss and turn all night?
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