I quite agree with you Leticia. It is dreadful the way things, not just cards, are stereotyped for young children. I was very attracted to some small teeshirts in Lewis's when 2 of our DGC were on the way and we didn't know what they were - stripes in bright colours, and very cheerful. However, when I found out that they were in the boys' department, for babies mind you, I was so cross that I didn't buy them, and told the assistant why. I don't think she had a clue what I meant. Also in JL, the Lego I was going to buy for DGD was in the boys' shelves (I think they've since changed that, at least - hope so anyway).
To return to the OP, some of the Simon Elvin cards are not so bad as they don't always say Birthday Boy or Girl, they can have nice pictures, they tend not to have much of a message on them, and they are cheap too!