Hi DD is 5 weeks now and is still having 2 hrly...

Hi DD is 5 weeks now and is still having 2 hrly feeds. She only feeds for 10 mins on one side then clamps her mouth shut and refuses any more. Overnight she goes 7 hours then 4 hours and then does 2 hourlys all day. I just was wondering if this is ok for her age?? My other 2 were bottle fed by this age (due to problems). I don't mind feeding so frequently as other 2 kids are at school all day so I have the time. She has gained 1.5kg and grown 5cm since birth so I guess it is working for her. thanks for any help.