N.Y. PEN. LAW § 135.55 : NY Code - Section 135.55: Substitution of children

A  person  is  guilty  of  substitution  of children when, having been
  temporarily entrusted with a child less than one year old and  intending
  to  deceive  a parent, guardian or other lawful custodian of such child,
  he  substitutes,  produces  or  returns  to  such  parent,  guardian  or
  custodian a child other than the one entrusted.
    Substitution of children is a class E felony.