I think my baby is cluster feeding??

He’s been eating every hour but the feedings are getting shorter and shorter he’s only 4 days old so I’m not sure if there’s anything wrong with that. He ate at 5 for 14 mins 6 for 9 mins 7 for 16 mins 8 for 7 mins… and then just now he was only on the boob for 2 mins is this normal ? How do I know if he is eating enough ?