Is it normal for a 10months baby to drink only 100ml every 3hrs? Is it too little? Solids will be 2-3 times and each time 2-3 table spoon.

The amount of milk that ur baby is drinking, is within the range. Try to increase both quality & quantity of solids. Include fruits & veggies too. My son is 11months old, I feed him 4times a day & quantity is around 10spoons or even more. Try different recipes & let him taste different varieties so that the baby will love to eat. Try baby led weaning and let him involve.