my 3.5 month old baby is on both breast milk and formula milk bcouse I have reduced milk supply. in which month she can give other food items?

A. dear mother any kind of semi liquid should be started 6 month onwards or if child is a healthy Enough from five month and is holding the next you can start giving semi liquid basic diet from five month onwards that may include fresh fruit trees like banana and apple Dal ka pani Rice Water Suji Kheer all Cerelac