baby cot or mattress

Honestly, cot will be abit waste of money if you dont sleep train them. We bought a cot but ended up didnt use after baby turned 2 months old cause he co sleep with me. Hence we changed to a bigger mattress. Mattress is possible, but you gotta get those very thick kind, whereby its about 40cm tall all that. Safer for you after you give birth, dont wish to have any tearing all that