On demand feeding,however,if baby sleeps at long stretches,you can do away with feeding for 3-4hrs only once in 24 hrs. Else feed every 2.5 hrs.

2-3 hrs is fine..

Two to three hours gap is fine..

2 hours gap is fine.. As once fed it takes around 2 hours for babies to digest the milk..

If the baby demands, feed him. The routine will take time to get set since baby is too small.; Also, even if the baby sleeps suddenly after 5minutes feed, make sure you tickle the feet, wake him up and Continue little longer.