Did anyone put your newborn or infant onto a normal mattress to sleep instead of a baby cot? What do you think of using mattress because it seems more practical that way.

We put baby there to play and sleep in the day time since 2 months till now that he is abt 7 months. But now he knows how to flip and can flip quite fast so there were a few instances he flip off the bed and land on the floor and cry - my mattress is the standard single mattress - not the skinny kind. At night baby co-sleep w us or sleep in the cot in our room. Normal mattress will be ok if u putting against the wall and have the bed shield at the edges or encompass it w pillows. But for newborn they can turn much - just ensure it's a hard mattress if u do choose so