At 32 weeks pregnant we have still not purchased our baby monitor. I'm really debating on when to buy it exactly. We plan to room share until LO is 5 months or so maybe a little longer. LO does have a nursery with his/her crib in it that we will use at some point. I do plan to put LO in crib for naps whenever I feel he/she is old enough (maybe 2-3) months. Our main level has a really open set up and from our living room, bedroom, and kitchen we will clearly be able to hear if LO is crying. Did you use your monitor right away? Or did you wait to use till LO got older?