Your 4, 5, or 6 month old baby's sleep is undergoing some big changes during this stage: you're finally past the constant waking and eating of the newborn stage, and you can look forward to a more predictable daytime schedule as well. However, if you're still dealing with lots of night waking or with short naps, don't worry - these are very common problems at this stage. Your 4, 5, or 6 Month Old Baby's Sleep: An Overview By 4 months, your baby's sleep patterns are beginning to change