User blog comment:IamJakuhoRaikoben/Chapter 457: Naked Battle, Review./@comment-160.177.253.77-20151019095420/@comment-7418318-20151019100124

Unless Brandish is much older than she looks I doubt the timing of this would work out.

She looks like she's something around 25, which would mean she'd have to be close to Lucy's age if you factor in the 7-year-timeskip. And at that time Layla was already married with Jude and too weakened to be an active mage, so I dobut she's have gone on a journey long enough to get pregnant and bear a child without Jude noticing.

Besides the way she was described so far, I can't imagine Layla abondoning a child of hers.