Bad parenting, my ass! This is actually great parenting.
By leaving his baby outside, he's assuring he won't accidentally gamble it away.
It's like how when you go to Vegas, you don't bring all your ATM cards. You leave one behind so you'll have cash when you get home. He probably took his baby he didn't like into the OTB and left the good one outside so even worst case scenario he'd have at least one baby to take home to his wife.
[via I Am Bored]