Is a softer mattress bad for baby?

Girl I feel this!!! My son is also bf and although doesn’t feed much in the day now, he is on me ALL night. He’s now on a floor bed with a normal firm mattress which is much softer than the cot mattress we had. At this age it is okay to have them on a softer mattress. There is “too soft” still and avoid memory foam at all costs. But you can always pad out the mattress with a sheet but bear in mind this will hold more heat too. Can’t say there’s been any sleep improvement but he now enjoys his bed. We also use a toddler pillow and duvet for him (duvet sometimes, pillow most times)

We have a double sized floor bed and the safety advice is that firm - medium firm is safe over 12 mo. We have gone with a firm ikea mattress for peace of mind but it’s a lot better than her cot mattress which was stiff as a board (understandable for small babies but can’t be comfortable at toddler age). Avoid anything with thick quilt pockets over the top or anything with foam / memory foam