You are doing a fab job. Just know that it's completely normal albeit rather tiring. My DD was the same at first, even now she will have a day here or there where she's constantly feeding. She's just getting the hang of things and their tummy's are so tiny at that age and breastmilk digests quickly. Her feeding lots will help your supply along and don't forget she may just be feeding for comfort and to be close to you, she hasn't been out in the world for very long Feeding lying down is awesome, we do that too especially overnight. If your other DD still has a day sleep, try feeding lying down at that time too until she goes off to sleep. Hang in there, it does get better!