Frustrated

So I took my daughter into the Dr for a weight check. She's 11 months old and the Dr said she's underweight. She's an ebf baby and she eats everything we do. The Dr made me feel like a shitty mom like I'm not feeding her enough. She asked me what she ate in the mornings I told her and she tells me she needs me calories. My girl can eat two eggs and beans for breakfast. She eats so good in my opinion. Me and my husband aren't heavy people we are both petite but that doesn't seem to matter to the Dr. I've gained weight to produce better milk, I've fed her the way the Dr asked but its still not enough. The Dr gave us pediasure to give her and said we needed to fatten her up more. I'm so mad and frustrated at the same time. The Dr said it could be that she's weaning herself from you and not getting enough calories. Yea that didn't make me feel any better at all that made it worse. Any other mommas experience anything like this.