Sleep through the night

Hi mommies! My baby is 5 months plus. Realised that he has been sleeping through the night lately and will wake up at 7 am the next day. His last feed is usually at ard 10 ish pm going to 11 pm. Should i wake him up for his feed? Hes drinking 120 ml every 3 hrs. Have yet to introduce solid food to him. I read articles and it states that its good when babies not newborn who can slp through the night but my mil and sil are saying otherwise.