We did similar to Nurse Dan, set up the baby's room very early and everytime we found the cat in the cot he got told off. We were lucky that the cat wasn't interested in the baby when he came home - infact he was scared of it - would run away. Now that we have a toddler the cat is even more scared of him. He will sleep at the end of his bed, but never got into the cot when the baby was in it.