Plz help me out. For baby for one time?

Hello Doctor, My baby has completed 6 month on this 26th of February. I have started to give him solid once in a day. But from past one month my baby is not feeding well . He latch the nipple but not suck properly. He looks on light,fan, and other things. Sometimes I sqeeze the milk and give to him by spoon .milk is around 30 to 60ml. Is it  sufficient for baby for one time?? But everytimes it's not possible. He never cries for the milk or never demand for the feed. So it's very tough for me to understand wheather his stomach is full or not. I am really worried. So, what should I do. Should I give the solid at  3 times. Or should I give nan pro 2 hours of gap and what should be quantity at one time. Doctor please help in detail. His weight is 6.2 kg.