I'm currently spoiling my baby who is 4.5 months old

...She is so cute and I love her to death...but I'm wondering... is spoiling her a good thing to do or not? I'm afraid she'll get agressive when she doesn't get her way in the future.
To those who have spoiled their babies, how did your babies turn out to be and at what age? Sweet, affectionate, bratty, very attached, jealous, insecure, confident, demanding, bossy, aggressive, loyal, etc?