Feedings help

How often and hope much are you feeding your little one? My LO is 6 mths. We were doing every 3 hours still 4oz, 9am, 12, 3pm, 6pm, 9pm and then she'll sleep until 6 and get a bottle at 6. But lately she will not eat at 9am or 3. She screams and cries and will not eat at all. Should I just take those bottles out and give her more volume at the other times since she seems to just not be hungry until those times? Any advice would be greatly appreciated. I've been super stressed and anxious that she isn't eating enough and when I called the pediatrician they just said keep trying... 😞😑 I haven't even tried solids or purees yet because she isn't even drinking so.