It commonly peaks between about 10 and 18 months. Brief, warm goodbyes, peekaboo games and predictable routines help build security. It can temporarily disrupt sleep, and it's a sign of healthy attachment, not a problem to fix.
Glossary
Separation anxiety
Separation anxiety is a normal developmental stage when a baby becomes distressed at being apart from a parent, often emerging around 8 months as they grasp that you still exist when out of sight.
Related guides
Separation anxiety
That sudden clinginess and crying when you leave the room is a sign your baby loves and trusts you — it's a healthy stage you can gently support.
The 8–10 month sleep wobble
Around 8 to 10 months, big motor leaps and separation anxiety can shake up sleep that had settled — it's developmental, and it passes.
Related terms
General information, not medical advice. For concerns about your child, talk with your doctor or child-health nurse.