Separation Anxiety

Libby

My daughter is almost 8 months old and the past two nights for bedtime I've placed her down in her crib sleepy and have walked away, only to have her scream as soon as I leave the room. She normally sucks her thumb and puts herself to sleep with out any problem, so I'm wondering if this is a separation anxiety issue? I'm really not wanting to create any sleep props! Has anyone gone through this? Any advice? Or any idea how long this will last?