@kars My baby was diagnosed with failure to thrive at 6 weeks. I'd like to share our story to hopefully give you some hope. He has some medical issues that won't apply to you, but hopefully the feeding side is something you can relate too.
My little one was born at 6lbs and other than tube feeding for the first 3 days due to low blood sugar I EBF. He gained weight fantastically for 3 weeks then stopped. I won't go into all that we tried before in the next three weeks trying to get his weight up. At 6 weeks he was diagnosed with a heart defect, heart failure and failure to thrive and was admitted to the hospital.
He needed to start meds for his heart and we worked to try and get his weight up, then at 7 weeks, while we were still in the hospital, a liver problem was discovered and he had to start on a special formula.
I was devastated, I couldn't stop crying, the emotional hit is so so hard, but I knew it was being done in his best interest. I decided to pump, we didn't know at the time of his liver problem was forever and if I could go back to BF I wanted to be ready.
Pumping was hard. We were still in the hospital and trying to find time to pump in between his care needs was so difficult and I didn't manage to keep a strict pumping schedule and my supply dropped.
4 weeks later we got the go ahead to drop the formula and go back to the breast and this is where I knuckled down and focused on pretty much nothing but feeding.
It's been 4 weeks since then and his weight gain is now steady. My supply is up and I direct breastfeed every feed, with a couple of bottle top ups of expressed milk and a few pumps a day. I will probably not drop the bottle top ups until after his heart surgery just because he needs the extra easy calories.
It's hard, I'm glad I did it because I enjoy it so much, and now that his conditions are stable he gains the same amount of weight from the breast milk as he did the formula so I know I'm not hurting him.
All advice and guidance I've seen regarding maintaining and increasing milk supply tell you to pump at least 8-10 times a day with middle of the night pumps but it is a grueling schedule that isn't achievable by many especially if you don't have constant support. I did not manage that. Whilst formula feeding managed about 5-6 pumps a day and when he was back on breast milk about the same, but I had a freezer stash to fall back on. I slowly built my supply up over several weeks and even that was hard work.
Pumping tips:
-I have a hospital grade double electric breast pump. I cut two small holes in an old sports bra and I use that for some hands free pumping.
-Whenever I was feeding him a bottle I would prop him in some pillows pretty upright in front of me and pump at the same time. I did paced bottle feeding so could get a 15-20min pump in whilst feeding him his bottle.
-If he was having a good nap in his cot I would power pump, many a pump was cut short however if he woke. But anything was better than nothing.
I know I skimmed over a lot of details but if you have any questions feel free to ask. Also know that if you have to switch to formula it could just be temporary, getting your little one to gain weight is so important at this point. Also don't push yourself to hard. You don't want to work yourself into the ground and burn yourself out at a time where you should be enjoying your little one.
Good luck xx