That sounds normal to me and reminds me of my daughter when she was weeks old. Even at 12 weeks old she was only taking 2 oz on the bottle. I think she made up for it when she breastfed later in the day. As baby gets older, they get more efficient at the breast. There are also weeks when baby doesn't eat as much as the previous week. It's so hard not worry about how much your baby eats and at this stage we moms tend to obessess over the amount of feeding, color of poop, how often they poop, etc. I know I did. I eventually had to loosen up or I was going to drive myself crazy. I had a very efficient eater who didn't drink a lot but she grew just fine. My doctor told me that as long as she was gaining weight, don't worry about how much she eats or how often. Babies are built to know how much to eat and how often. They don't starve themselves. You'll see there are some 6 week old babies drinking 5 oz and other ones drinking 2 oz. You might have an efficient eater on your hands like I did.
