BF- my PiL is wrong about this right?

[angelican]

My pil keeps commenting that my sil is doing well to bf her baby as "there's not much on her" whereas he never said anything similar about me bf to 18m, in fact was very critical, but then again I am a size 16

There is no correlation between weight and ability to bf is there? I mean unless a person is extremely underweight? If there was surely bf rates in the West would be higher not lower?

[AJPTaylor]

He is an idiot. But you probably already knew that.

[Nutkins24]

No of course not. If she were very underweight she might have to eat more calories to sustain her weight and feed the baby though.