security blanket

noun
1.
a blanket or other familiar item carried especially by a young child to provide reassurance and a feeling of psychological security.
2.
someone or something that gives a person a sense of protection or a feeling of security: His wealthy uncle is his security blanket.

Origin:
1965–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
security blanket
 
n
1.  a policy of temporary secrecy by police or those in charge of security, in order to protect a person, place, etc, threatened with danger, from further risk
2.  a baby's blanket, soft toy, etc, to which a baby or young child becomes very attached, using it as a comforter
3.  informal anything used or thought of as providing reassurance

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

security blanket

Something that dispels anxiety, as in I always carry my appointments calendar; it's my security blanket. This colloquial term, dating from about 1960, was at first (and still is) used for the blanket or toy or other object held by a young child to reduce anxiety.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Having concluded that there is no afterlife can be as much of a security
  blanket as wanting to think there is one.
And she's not wrong: books have always been my comfort food, my security
  blanket.
It's not so much about the actual odds as about having a security blanket.
It is a security blanket and has been reinforced by previous generations deep
  belief in the system.
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