Hi I’m Emmy, When my son turned 3 months old he started sleeping through the night. He would go to…

Hi I’m Emmy, When my son turned 3 months old he started sleeping through the night. He would go to bed around 9:00-9:30 and not wake up till 7:00-7:30. When he turned 4 1/2 months he stopped and now wakes up at 4:00am on the dot and sometimes more than once a night. He is now 5 months old and I’m wondering when this will end or how I am gonna stop it. 😫 I even tried putting him to bed later, putting oatmeal in his bottle, making him take less naps..