Baby weight at 10months. Additionally.

My baby is 10months today..he is 35weeks preterm baby with birth weight 2300gm..his weight gain is very slow..for past month he has not gained/lost weight..he is maintaining the same weight..je has some loose motion problems in the month..we are giving solids foods as per his need ..morning..rice dal cocnut milk/cocnut oil with pumpkin/ash gaurd sometimes carrot also ..at around 3pm we give banana/boiled egg yoke/apple pure/papaya pure..any of the above at night we give ragi mixed with cocnut oil..and additionally 5-6times breastmilk as per his demand..as drops he is given vitD3 and iron drops..but he is not gaining weight..at 10months he is weighs only 7.6kg his height 72cm His achieved milestones 1) he sits without support and plays 2) he calls acha..mma..and other two to three words 3) identify things..when we ask where it is he points towards it 4) social interaction is good 5) no teeth till now Why baby not gaining weight..what can i give additionally..?