I've always craved for a baby since I was about 15. I know having children is going to happen for me someday but I always imagine myself having a daughter .. Never a son. I'm a baby person and even have names picked already. I'm prepared to have a girl but never a boy. Is this a really bad thing?
It could be bad if you have a baby boy and you don't like your baby because you feel that it crushe your dreams of having a daughter. But I doubt that will happen, I'm sure you'll love your baby no matter what.
It could be a bad thing because it could mean that you want a toy doll not a baby...the sex of the baby should not be of importance IMO and if is then it could be a sign of sumin unfair.
Everyone has his/her preferences and that's fine! But you should be satisfied with whatever God blesses you with! Whether it be a baby girl or boy :)