Baby Growth concern. Through all this?

Please help.. my baby is almost 7 and half months.. does not eat anything.. nor rice nor vegetable puree.. nor cerelac.. nor any powder milk formula.. but feeds little breastmilk.. that too in very less quantity.. keeps on crying a lot.. what is the right way of giving food at this stage??? Am I too early to start all the above said??? Baby looks very tired, weak and thin.. has lost weight.. Other neighbour kids of the same age are very healthy and little chubby.. I feel real concern on her stopping intake of food.. to be mentioned her skin colour have turned very pale as well... are there any mothers who have gone through all this??? If yes what solution you tried to sort it out... Please help, I will be really greatful !!!