Baby not meeting weight goals pediatrician wants.

First off my daughter was born at 36w 5 days. She weighed 6.8 pounds. When leaving hospital she weighed 6.7 pounds. At her 1 week appointment she weighed 6.14 pounds. I was breastfeeding it lasted 1 month. I dried up and switched her to formula at 1 month she weighed 7 pounds exactly. The dr had me vist back at 5 weeks with new formula She weighed 7.2. A week later we came back.. She was constipated. Gassy. So they put her on soy formula. And perscribed a daily laxative. She weighed 7.5 pounds. At 6 weeks. A week later after finally pooping three times a day for a week. At 7 weeks she weighed exactly the same. I had noticed with all her pooping she had become alot more hungry. I asked could i give her more then 2 ounces at a time. The said no. They told me no cereal either. My grandma had suggested that also to feed her more. They told me no more then 2 ounces at a feeding. And wait 3 hours to feed. They said no cereal no karo syurp for constipation. And they wanted to have me take her directly to childrens after i left there. To have blood tests and a possible spinal test and most likely have her put on newtramogen.. The dr said she has a metabolism issue.

The whole time im confused. Im fumming mad because i dont feel a 7 week old baby needs laxatives. And why on earth cant i feed her more if shes hungry.. I see other babies on here eating atleast 3 to 5 ounces at 7 weeks. I felt like i wasnt being heard i felt like they were jumping to conclusions and mostly i felt like my baby hadnt had enough time on this new Soy formula. In my mind she just spent the last week shitting out poop she had bulit up and eating what weight she had lost from pooping so realistically her remaining the same weight after 7 days was perfectly ok. Ladies help me figure this out. I feel like shes fine no gas no spit up. and i should feed her till shes full and wait till her two month check up before worrying about her having serious issues. Or maybe just take her to a different dr. I dont feel in my gut these people are the right drs for us. Not to mention i saw only nurses in the office. I never even met her actual pediatrician. Do i follow my gut and get a second opinon or do i do what they say after all they are drs.

UPDATE:

So my husband and i shared this goings on with my MIL. That women had the gall to look me in the face and say "if you dont do what those drs said and take her immediately you would look and feel like a shitty mother." i swear i bit my tounge in half.