Mommy's all good, little story time. We were born with a small weight …

Mommy's all good, little story time. We were born with a small weight of 2480 in the hospital and they gave us formula, we didn't have any problems with it, we gained 4kg from the formula, but now the problem is that because of the formula, it's causing issues. I'm afraid to switch to another formula because suddenly, if we switch to another one, we might not gain well. And I don't want to see my baby struggling. Three pediatricians visited, nobody said to change the formula, but the baby's herbal water, and putting it on the belly doesn't help at all.