The bard, as part of the rogue group, was one of the standard character classes available in the second edition Player's Handbook; in this edition, the bard was regularized.
Also, not all babies are born with blue eyes. Babies of African, Asian, and Hispanic descent are more likely to be born with brown eyes. This is because darker-skinned individuals tend to have more melanin in their eyes than Caucasians. Even so, a baby's eye color may deepen over time.
Brown-eyed parents can easily produce blue-eyed babies. The gene for brown eyes is dominant, so if each parent had one BROWN gene and one BLUE gene, they'd both have brown eyes themselves, but could easily pass on blue eyes to their children (about 25% of the time). Simple genetics.