I've always loved figuring out sayings like "U R the 1 4 me". When I was a kid Highlights magazine always had little puzzles like this. Some people have car tags with numbers instead of words that are fun to figure out and annoying when you can't! I'm not sure if this is a numeronym or not. K9 for canine is an example of a numeronym. Whatever this is - it's fun!
The kids on this vintage valentine remind of Louisa when she's trying to talk. Something about the chubby cheeks and the open mouth, I guess. I've got these cuties ready to download below, if you have someone you'd like to give it to who is the 1 4 U!