Stopped waking up my boy when he was 3 weeks and I feed him on demand. Enjoy the sleep - it won't happen every night.
If he's above his birth weight and is gaining weight there's no need to wake him, he'll wake you/ let you know when he's hungry
Id say no unless your baby isn't gaining weight, my Lg is 10 weeks and some nights she sleeps through the night, shes only been taking 5oz bottles so your LB sounds like he's taking enough milk to not be woken if he drinks 6-7 ozs