11. Normal
Separation anxiety is a common occurrence that takes place when a young one displays severe stress and anxiety when parents leave even for short amounts of time. It typically starts at around 6 months and reaches a peak in between 10 to 18 months.
This stress and anxiety typically manifest itself with the baby sticking on to the moms and dads, shouting and sobbing in a panicked way when they leave, along with having sleep problems. Was this the answer?