NB Sleeping 5-6 Hours , Should I wake her?

Jax

Hi All , my lil one is almost 4 weeks and sleeping about 5 -6 hours a night. I breastfeed her about 8 to 9 times a day then top her off with a bottle of HIPP formula before she heads to sleep around 11PM. Is this ok ? Should I let her sleep ? Currently over 9LBS was born at 8LBS