Is anyone else's 4 month old waking up 3-4 times a night ?

My baby is so restless when he sleeps. He wakes up twice to eat during the night and then another 2-3 times, whining, and restless. He falls right back to sleep if i pick him up (if i don't get gets so restless it makes him upset and he is wide awake) but I don't understand why he can't sleep very soundly. I thought by 4 months old, most babies should be sleeping and though the night by now.