I agree with Molly. And maybe this daycare center was fine for your older daughter because she didn't need as much attention?
If you have to work then obviously you do, but some babies really just need their mommies, and it's unfortunate when they can't have them. I remember when my oldest was a baby, and I put him in a daycare at a woman's home. He was a very self-sufficient kid at one year old, and he did great at that woman's daycare, but when he was younger I had to hold him all the time or he would cry. I remember at that daycare there was a baby girl probably 8 or 10 months old who was crying in a playpen. The woman running the daycare made some remark indicating that she was spoiled, or difficult, or something of the sort, and I just knew the poor little thing just needed to be held and attended to. I picked her up and held and rocked her for a while, and she was happy. To this day, 18 years later, I sometimes wonder how that little girl turned out.
Anyway, not sure what my point is, but a 7 month old should not be allowed to cry endlessly. It messes with their sense of security.