ALMOST 6MOS OLD ONLY EATS 20 OZ A DAY

So my son will be turning 6mos in a week. And still only drinks 20 oz a day. 24 oz on a good day. Is this okay? Anyone of you had the same experience with their kids and they turned out okay?

He’s a happy and energetic baby but I am concerned that he isn’t eating much. From what I know he should at least eat 28-32 oz a day. On his last pedia visit he was only on the 8th percentile for his weight.

We already started solid food and he loves it. But I don’t want to rely on it. I still think milk is the best for him at this age. Do you have any tips or suggestions on how I can encourage or make him drink more milk? Or should I just let him be?

Sorry I’m a first time mom and I’m afraid that I’m doing this all wrong.