Apparently, “Having a baby changes everything” is a service mark of Johnson & Johnson. They have an advertising campaign built around the phrase. Here’s what they say, in part, about the campaign:
When you look at the advertising, you’ll feel Johnson & Johnson understands your life has changed and we are there to enhance the bond between you and your baby.
I suppose they must be credited for being honest about how they’re trying to manipulate us. Somehow the notion of a company like Johnson & Johnson (or any company, for that matter) claiming to “understand” anything, least of all the “bond between you and your baby” seems far-fetched and, well, creepy.