waking up crying

Ginnie
Hi, 
I have a little one (25 days old), who for the last two days wakes up crying. I believe he needs more sleep usually, so I hug and rock him and indeed most of the time the crying stops and he goes back to sleep. It usually doesn't last long and he starts crying again and again until eventually I just grab and hold him and start breastfeeding him. Most of the times he eats a bit and then falls asleep on my breast....
He needs to sleep more, I think... how can I help him? What could be causing him to wake up crying?
Thanks in advance. 

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