I also agree - if they are gaining at least 1/2 oz a day then they are okay, even if that is the low end. And it's frustrating that babies weighing 4 pounds and 10 pounds are supposed to gain the same - that's silly! They don't even eat the same amounts!
When my twins were born, they both lost a lot of weight. They were 37 weeks and not premature (actually, their apgars were nearly perfect!). Olivia was tiny, 4#9 at birth. She lost down to 4# even, and looked terrible. She was barely gaining anything, and starting to look very gray and was lethargic. The ped that they saw was pushing formula (even though I had plenty of breastmilk) and telling me that I needed to give her bottles - he was not a good doc. I stopped seeing him when they were 2 weeks (and still way below birth weight) and had one of my midwives come for a day to watch the feedings. (She's a postpartum doula and LLL leader as well.) Both babies had good feeding techniques, but were so small that they tired quickly. She recommended giving them syringe feedings (0.5-1 oz) of EBM after they nursed. (I just put my finger in their mouths and gently squirted milk in there when they started to suck.)
It was amazing, especially for tiny Olivia. (Laurel was a chunk - her lowest weight was 4#12.) Within an hour of giving her the first complementary breastmilk, she was alert and actually cueing to nurse. You could literally see her regain her color - within a few minutes of the feeding, she had a pinkish glow, instead of gray. She finally had enough energy to nurse effectively, and stopped falling asleep at the breast after a couple minutes. I did these feedings like this about 5 times a day, and within a week Liv was doing so well that I stopped.
They didn't regain their birth weights until they were nearly a month old. This would be very alarming to most pediatricians, and I would have been under a lot of pressure to give them bottles (so they would know how much they were drinking). But I stuck to my plan and kept my babies in kangaroo care almost constantly, and it worked. By the time they were 3 weeks old, they were gaining the more typical 1 oz. per day. But every baby is different! They are now in the 10-20th percentiles, which is normal for my babies (my toddler is and has always been there).
However, I have to say that if your doctor was REALLY concerned, he wouldn't have waited 2 weeks - he would have said 2 days. He's just following protocol, CYA, you know? Have you thought about doing some weighings yourself (that's what I did to make sure my babies were gaining well)?
I'm glad to hear that he's not getting bottles anymore, and I'm sure he will get better at nursing. Bottles doing require much effort to get any milk. Usually by 6 weeks, most of the nursing kinks have been worked out for both of you. Even though I'd already nursed a baby when my twins were born, I remember being very awkward nursing them at first. It had been almost 2 years since I nursed a little baby (my daughter was also very tiny and had the same problems with tiring out - she did SNS) - I was used to nursing a big toddler!! But by the time they were a couple weeks old, it was old hat again. Now I can nurse them together while lying on my back in the bed.
You can do it - go momma go!!
