Baby needing to sleep inclined

My husband noticed that our son js much happier during and after sleeps if he sleeps in his chair ratger than a bed. Tonight, at 10 days old, he slept for 3 hrs, 2 hrs, then 4.5 hrs! I don't want him to always sleep in the chair, but he is soo much happier! We think he maybe has acid reflux and that is why the incline helps.