DH made a little side car bed thingy for our second son. he attached it to the bed frame and we had the mattress sized properly and cut so no danger of bubba rolling into gap. we had a board on the side so he didn't fall out and he used this from when he was newborn to about 3. i just fed him and slid him over to his 'bed'. we got rid of it as zak grew older but we are considering making another one for oscar. hmmmm best get onto that.
sorry i am not explaining it very well but it only cost us about $40.
beckles