My 7 months old boy will wake up for every 1hr and start crying. not sure why and how to make him seep atleast for 3hr.

A. They could be two situations either your child is hungry not full with the feeding which is why child wakes up a small span of time to take a feed and if the child is not taking feed and crying constantly that means it could be due to stomach pain you can give stomach pain medicine and then you wait 5 to 10 minutes your child is going to settle down and then sleep well afterwards