how i hope my baby can sleep thrgout the night. it does not matter if they dont't wake up for night feed. the rule of waking baby for milk (no longer than 4 hours break) generally applies to newborn or very young baby.
remember the rule of demand, they will naturally wake up if they sense hunger. as long as yr baby is gaining weight well, it is fine. i think yr baby doing good in the day with 120ml per 3 hours:-)