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.

Babies aged 9-12 months general take in 24-31 oz (about 700-900ml) of formula. From your description, baby is drinking about 800 ml a day, which is well within the range. As for the solids, baby will eat the amount that is just right for baby so if baby eats just enough and does not show signs of discomfort after, I reckon it's okay. Make sure the solid foods given are substantial and packed with the necessary vitamins and nutrients :) http://wholesomebabyfood.momtastic.com/howmuchbabyeat.htm#5