my DD ahs slept for 8-11 hours over night since 3 days old.
my supply has not been affected i have over supply at times.
we feed 2-3 hourly during teh day and she does a big cluster feed from 6-8pm then thats it she off to dream land till 7 the next morning.
on a bad night for us she is awake at 5 am.

i have never woken her for a feed, as i feel she is sleeping she is growing and thriving, she has already outgrown her clothes was at birth weight 4 days after being born and only lost 100 grams so she didnt nee dto put alot back on, but is gaining around 150grams a week which i feel is great. she is very alert and very happy.

DD2 is teh most content bubba i have seen..

if her supply si good and she is happy then all seems well, yes it si reccomended taht they sleep between 5-6 hours at most but not all babies do that.

so as long as he si growing adn ahving regular wet dirty nappies i dont see an issue