6mths diet

Hi mummies, my boy is currently 6mths old turning 7 mths in 2 week time. To check is 180ml milk for every 2 hrs is it too much? Thats when my in laws are taking care of him. When it come to my hubby and I, baby is taking 180ml every 4 to 5 hrs and his find....which is right which is wrong? I'm worried he's been overfed