No, you can't say it that way. "
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4444mvPut to sleep means kill. Another meaning is to make someone unconscious before a medical operation by giving them drugs. (Longman dictionary)The phrase "put (down) to sleep" does not mean to kill when used with babies! It can mean that with regard to animals, especially pets, as a gentler way of saying "kill".
4444mv Is this an American expression or is it used in England too?It's definitely common in America. I can't speak for how common it is in British English, though I found it used on UK websites like this one: http://www.nct.org.uk/parenting/sleeping-safely-your-