Honestly, I don't see how "for babies" could be trademarked since it's a literal phrase describing the product. "For Dummies" is not used literally.
That's not to say generic words / phrases cannot be trademarked. Just look at Apple. However, trademarks for a generic term must be very limited in scope initially. If the brand obtains substantial recognition, then a broader trademark may be granted. These broader trademarks are typically reserved for household names. Even Apple had trademark issues when they entered the music industry due to Apple Records.
> Honestly, I don't see how "for babies" could be trademarked since it's a literal phrase describing the product. "For Dummies" is not used literally.
Neither is "For Babies" specific to the series I am describing. The book series is not for babies, as far as I am aware, very few, if any, babies are capable of reading, let alone fully understanding stories that are read to them.
"For Dummies" effectively means using laypersons language to convey complex topics more easily. Not, as you said, to literally mean the readers are of low-intelligence.
Likewise, "For Babies" effectively means using language, images, and story telling to convey complex topics more easily to young children, not just for literal babies.
