fighting sleep

Hi mummies! My LO (3 weeks old) tends to fight sleep and will fight to stay awake after his feeding at times. It can sometimes last until the next feed which is 2-3 hours later. We'll carry him when he fusses and cries, but once he's asleep, we put him down, he starts to cry again. The cycle continues until next feed. Are there any implications as I read that newborn should not be awake more than 45-60mins at 1 time. Pls advise! TIA!