Like somebody else said, as long as they're gaining and don't whine I wouldn't worry too much. Your thread reminded my of my first yorkie, Sally, ( she's now dead). She just acted as yours does when she was a first time mom. Her puppies would cry to feed and she either ignored them for a while or got with them, fed them for a very short time which was obviously not enough and ran off. I had to hold her still sometimes so that the puppies could suckle. I guess some don't have much of a mom temperament
Post pics of them as soon as you can.
Rubi, Jennie and pussy cat Mimosin