Best formula to top up feed at night

Alyson

I generally exclusively breastfeed, but ive noticed that at night my baby girl will not sleep - its like she isnt getting much breastmilk.. so ive been giving her the ready to feeds formula that ive gotten from companies to help her out and she usually basically finished the bottle and then knocked out.. has anyone ever had this issue? And also whats the best formula out there for baby.. she is a week old.

Thanks.