Should i be worried if my 8 month old son is still waking up every 3 to 4 hours to eat? should he be sleeping through the night?

See below: Your child should not need to feed at night. He should be sleeping through the night at his age. When you put him to sleep, i would lay him down tired but awake, and let him fall asleep on his own. Then, gradually increase the time you take to respond to him at night.

See your doctor: Problems like these can only be correctly handled by your doctor in person. He/she needs to listen to you, perform an examination and possibly run labs or other tests. That's the only way he/she can find out what's going on and what to do about it.