Normal for 3 month baby to have only 5 feeds per day?

Hi mummies, My boy is 3 month old. He has been sleeping through the night roughly from 9pm to 6am, sometimes 7am plus. At least 6-8 hours. With that, his feed become lesser. About 5-6 feeds per day. Usually he will be drinking milk 3 hourly with each feed around 140 ml - 150 ml (water + formula). Is this normal? I am worried that he is not drinking enough milk since he is a growing boy. Can mummies give me advice what should I do?