Is it for 15 month old to breastfeed and eat no food?

[TongueTrouble]

Does anyone know if breast milk would meet all of a 15 month olds needs in terms of calories and nutrition if they were having nothing else?

My daughter has problems with her tongue after her tongue tie was ignored for ages and not cut until 11 months and she can’t lift it to swallow food due to muscular tension (I had to go to a private specialist to get this sorted) so she doesn’t eat anything apart from sometimes purée, nobody is taking it seriously, it’s effecting her sleep, it’s effecting my mental health having to feed her so often, I think she’s looking pale and she’s more tired, her under eyes are dark and family have been pointing out for weeks she doesn’t look well but the GP said there’s nothing to worry about because she’s a healthy weight and breast milk contains everything she needs nutritionally so it won’t be effecting her, is this right?

i know breast milk contains everything needed for young babies but surely not a 15 month old?

I’ve got a review with the SLT tomorrow so will be assertive, I just wasn’t sure if my GP was right that breast milk was fine still for her and I was making a big deal when it didn’t need to be

Basically, breast milk is low in iron. In the past, kids would have eaten a lot more dirt and they would get iron from that, but now, they do need food and or supplements past 6 months of age in order to meet their needs