7 week old feeding amount

Me
Any other moms have baby who doesn't eat alot? My baby girl is 7 weeks and only eats about 2-2.5oz. Of either breast milk or forumla or a combination. Except for the past week she has pooped like once an hr and doesn't seem uncomfortable but its very watery and she's been eating like 1.5oz and half hour later the other half oz. Is this normal?