I think he is still pretty little to be putting in a toddler bed. If your bub is due Oct, and spends 3 months in the bassinette, that still gives you 8 months before you need the cot. I know you don't want him to feel he is getting kicked out of his cot for the bub, but he might be more ready for it when he is a bit older, and you will be able to explain it better to him then.

take care,

kate