Should i start my hungry baby on solids? ?

my son was born at 9lb 4oz and from the start had a huge appetite.me and all my family have all been big hungry babies though so its not unusual.hes been puttin on around 10oz a week and at 10 weeks is now 15lb 6oz.hes been on formula from 3 weeks and his feeds were 250ml every 2 hrs.also from 3 weeks old hes slept through the night with 1 4am feed in between however the last 5 days hes been waking every 3 hours and feeding.his milk must no longer be sufficient in keeping him full especially now at night.do u think i should introduce some sort of baby rice?has anyone had same problem as me with a big hungry baby!