We use a pack and play for Izzy.. It's her "crate".. She only sleeps at night in it and when we her gone..( Most of the time Hubby or I are home ) She LOVES it.. We even took it on Vacation with us and it worked out great!!...
Just be carefull withusing it from the beginning.. It may be too big at first and you would not want your baby to start using a conner and his own potty area