Baby mattress

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I’m thinking of getting a new mattress for baby’s crib. It’s indented in the center? I’m wondering if this is causing some of her sleep issues because maybe she just isn’t comfortable. I’m going to flip it today, and see if that helps short term but wondering what crib mattresses you guys are using. I’m fine spending a little more money- my mom bought us this one and went with the cheapest she could find. I’m thankful she bought it but if it’s preventing our girl from sleeping I don’t mind spending to help her.

Any recommendations?