Feeding question

Was just wondering how often your lo ate around 3 months and how much?

My lo is eating 4-5 ounces every 3-4 hours. I’ve tried feeding her less but more frequently, but she just doesn’t take it until she wants it and will let me know she’s done around 4-5 ounces. My doctor told me i can give her another ounce to fatten her up more but i don’t want to over feed her... is how much she’s eating fine? I already thought the 5 ounces was pushing it but sometimes she’ll cry for another ounce. She was also born at 37 weeks and was only 5 lbs. she’ll be 4 months the 28th. Last check up she was just under 10 lbs and that was 3-4 weeks ago.