Crib at 2 months?

J

My son just turned 2 months. I moved him to his crib. Still in my room. He was wobbling in his bassinet and at time looked like he would top it over. Now my concern is the mattress to his crib is a normaly baby mattress but it seems super soft.. Like squishy. I dont sleep at night bc I'm scared hes too comfortable. I need help! Ideas anything :)