Hi there Net, and congratulations on your little girl!

I agree with the other ladies, if she's a good weight and feeding happily when she's awake then all sounds fine. She'll let you know when she's hungry. If I remember correctly, my DS was sleeping through from about midnight till 7am by 7 weeks (wish that had lasted a little longer...), and we freaked out the first time, but soon got used to a few hours undisturbed sleep - lovely! Will do no harm to ask your HV for advice if you are still concerned xxx