Hi I currently feed my DD 1 teaspoon of Farex ...

Hi I currently feed my DD 1 teaspoon of Farex once a day, and she always finishes the lot. Today will be her 3rd day on Farex, should I now start giving her 2 teaspoons of Farex??? I am very confused about the whole feeding solids part and I dont want to do anything wrong. Look forward to your advice. Thanks