Language: Pack n Play

9 Mth Old Sharing Room with 3 Yr Old and Having Her CIO to Sleep Thru Night??

Due to lack of space, we have our 9 month old daughter sharing a room with my 3 year old son. If we put her in the pack-n-play downstairs, she seems to have success sleeping through the night. If I put her in the room with my son, she tends to wake up in the middle of the night. I have no problem letting her cry it out. In fact we have let her cry it out while in the pack-n-play downstairs and it has helped her learn to sleep through the night. However, when I put her in the crib in the same room with my son, she tends to wake up in...