Security Item for baby

Danielle
My baby is now 7 months old. She was sleeping well up until she learned to sit up, crawl and sprout teeth all in the same week. Ever since she's over stimulated and has a hard time going to sleep. The only way she sleeps is if she's holding my hand. Which is beautiful and I love it but when you're standing over the crib for 20 minutes, and the slightest movement of my hand wakes her, it's time for a change. I'm looking for a security item for her to replace my hand and help her self soothe. Any suggestions?