photography : how to take a b/w pic then add color?

I want to learn how to take a black and white pic that has some color in it? can it be done without editing in photoshop? or if not then how? i have seen black and white pics with a baby for example, wearing a beanie with words on it and those letters are bright red. but everything else is in black and white.. or the pic b/w but have baby blocks spelling out the name, in color.. or the pic in black n white but have a colored bow wrapped around baby??? anyone with advice?
 
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