How much do you give EBM for 2.5mths old per feeding?

Anyone can share? How much that you give your baby expressed breast milk per feeding? Currently my DS drinks 100ml per feeding but he seems not satisfied. 90ml only can last for 1.5-2hours.
1 day he drinks 1000-1100ml. 10-11times feeding @100ml. I only can express 1100-1200ml per day. Worry if I give him too much or more than 1100ml,can't produce enough milk for him when he is 3-6mths old.
 

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