baby not eating as much

Kim

so my son is 7 months old and the last week or so he hasn't been eating much formula. He usually eats about 6 oz every 3 or so hours and now I'm lucky if he eats 3 maybe 4 oz when he eats. He still eats the baby food and puffs like normal but I'm afraid he's not getting enough formula. Is that normal or ok?