I see your grandson gained 9 oz- that’s great!
My grandson had severe reflux and had poor weight gain. Initially breastfed, but my daughter couldn’t produce enough milk. He was tried on a couple of different formulas, but it didn’t make much difference. He got medication and they thickened the formula with rice cereal to make it heavier and minimize reflux as well as positioning him so the liquids would be less likely to come up.
Once he started on solid foods it got better.
It is a very difficult situation.
Just follow the pediatrician’s advice. There are times when the baby needs to see a specialist, such as if there is no weight gain.
It is traumatic for the mother and she also needs a lot of support. Mothers often feel like failures this early after birth with the hormones flowing and all.
Let’s hope your grandson continues gaining weight.
Please let us know how he is doing in the near future!