Maybe they just let the real definitions do the work..
Designer: a person who plans the form, look, or workings of something before its being made or built, typically by drawing it in detail.
Baby: a very young child, especially one newly or recently born.
Yeah, I know, the designer handbags and shoes use another definition : made by or having the expensive sophistication of a famous and prestigious fashion designer.
One seems a more proper use of the term but not the most popular in connection to this way it is being used.