Just press on. You might find things change drastically in a week or so.. I remember having this concern with my 3rd bub who was also a good size. She was always a good sleeper etc and I remember in the first couple of weeks she slept a lot - I think she woke up a bit though and started feeing more.Cluster feeding actually - for hours at night (but slept through so wroth it).

Anyway excuse me rambling on but I think that with a healthy baby you can just follow their lead.