What to do when your baby won't burp. Josiah's been gassy lately and I guess it's due to his…

What to do when your baby won't burp. Josiah's been gassy lately and I guess it's due to his nighttime feedings. I try to burp him but either he'll just wake up cranky or just won't burp at all. He always winds up burping on his own but I'm worried about him being so gassy. Any of you mommies dealing with this?