Buying the right size mattress for baby crib

Šędúçtïvę
I'm currently searching for a mattress for the crib I've ordered for my baby boy. The only thing is I don't know if I should buy the mattress that's 38.00×24.00×5.00 to fit the crib which Is 42.00×25.00×36.00. I really need help. This is my first time buying a crib and mattress. Any suggestion??

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