FTM questions! Please help!

First time mom here and I’m wondering if this is normal!

1. My baby is 9 days old and he’s eating way more often (every 1.5-2 hours) and sometimes he will eat 20 ml or he will eat a full 40-50 ml. Is this normal for his feeding pattern to be scattered? He was eating 30 ml regularly every 3-4 hours before. (We did get the ok from our doctor for him to eat more)

2. After feeding he falls asleep immediately only sometimes now. He’s now staying awake for an hour or so in between feedings and then he will act like he’s hungry again? Should i be feeding him more to help him sleep? While he’s awake he’s a little fussy, but not screaming crying. I usually hold him or put him in his bouncer.

3. When falling asleep after feeding he will make noises such as grunting and whining very lightly. He usually does this a few minutes and then he will fall asleep. Does this mean anything or is he just falling asleep?

Thank you for any replies 🙏🏻