Night sleeping

I would like to know if there is anyone like me whose LO wakes up every 1.5-2 hours at night. It is sooo exhausting. My boy is turning 3 months on 30th of January and was hoping he would be sleeping better by now as my maternity leave is almost over and I have to go back to work. Usually I leave the house at 6 am so I have to be up before then to prepare. This boy wakes up 5-6 times at night and am not sure what to do to get him sleep at least 4-5 hours stretches.

He goes to sleep at 7-7.30 pm could that be the reason why? But he won’t go to sleep later than that he becomes soo fussy. Please help!!!!!