Autumn has two adult size, thin (so she can't use them as climbing devices) pillows in her cot - one at each end as she's such a mover. She was always sleeping on mine when in bed with me so I ended up giving her two of ours for the smell in the hopes she would sleep better in her own bed. We have a movement monitor so it has never really worried me SIDS wise - even if she's on top of it, her breathing can be detected ( I experimented LOL) She loves hers.