10 week old feeding schedule

I will preface by saying this is not my baby. We have her for 2 to 4 days and nights a week only.The baby is 10weeks old. She is still tiny. 20inches long, 13.5inch head, weight less than 10lbs. Right now she will only finish about 2 ounces of soy formula at each feeding. Then, around 1.5-2hrs later she wants another 2 ounces. Getting her to finish those 2 ounces is difficult. She would gladly stop eating after 1.5 ounces, maybe sooner. When she is really done eating, she clinches her gums so you can't put the bottle in. Is there anything we or her parents should be doing? Will her dietary habits change naturally? via /r/Parenting http://ift.tt/2a5za3e