underweight baby


My little girl is 2 months old and is EBF. We have seen our pediatrician weekly for her first month, after birth, for weighted checks. For those weighted checks she was in the 1% percentile for weight, now at her 2 month old checkup she is in the .1 percentile. our pediatrician ran blood work and we will get the results on Tuesday. He seems to think everything is fine with her. shes meeting all of her milestones she needs to be at, but just isnt gaining the weight. Has anyone else gone through this? BTW, I scheduled myself to see a lactation consultant for next week, just to see if its anything im doing wrong. Baby girl has been checked for tongue tie , she doesnt have it, and she has been feeding well and draining my breast pretty well after feedings.