8-9 Month Sleep Regression
At about 8 to 9 months babies there is another sleep regression. Babies also begin learning new physical skills, such as crawling, pulling to stand and then followed by walking. During this stage you also get language; babbling counts as language, as they are stringing sounds together.
A major development during this stage is the introduction into separation anxiety. Mommy or daddy leave the room and can’t be seen and the crying begins. They are simply expressing their need to see their caretaker. This can carry over at bedtime. As you leave their room, they are crying and communicating that they miss their mommy and daddy.
These major developmental milestones impact sleep. As soon as they master these skills, sleep should return back to normal.