Hello Doctor, My Son Is 6months Born Date 2jul2016, His

hello doctor, my son is 6months born date 2jul2016, his current weight is 8.5kg, currently he is having homemade rice and moong dal fully liquid and also wheat with pure ghee mix with boiled water , along with lactogen 1 in lukewarm water,
but do i need also start ceralac at this stage can you please suggest the appropriate meals , cos i feel as per his age he is under weight.appreciate your response.