My 9 month old not having solids she is having only 520 ml milk in a day and an egg yolk and small amount solids only like 1-2 tablespoons only

A. Teething can really be a very big reason which can lead to loss of appetite so you should give more of fluid based diet to the child by adding salt and spices and this is a good age to introduce family foods also so if you want you can try that also